AEI INCOME & GROWTH FUND XXI LTD PARTNERSHIP
COMPANY
10-Q
FORM
2026-11-12
FILING DATE
2026-09-30
Q3 PERIOD END
258
FACTS
SIC 6500
Filing Software CompSci
CIK 0000931755
Taxonomy US GAAP 2026  
SIC 6500
CIK 0000931755
Filing Software CompSci
Taxonomy US GAAP 2026  
Standard Concepts
95
Extended Concepts
3
3%
Extended Concepts
Errors
0
What are errors?
What are errors?
Indicate problems with an XBRL formatted filing that are sufficient grounds for SEC rejection of the XBRL portion of the filing.
Data Quality Errors
0
What are data quality errors?
What are data quality errors?
Indicate areas that may not meet the standards set by the Data Quality Committee (DQC), and may reveal areas where the XBRL can be improved.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 3776 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2023-12-31. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 3776 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2023-12-31. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9781797 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2023-12-31. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9781797 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2023-12-31. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 10837 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2025-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 10837 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2025-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 10480846 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2025-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 10480846 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2025-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 8171 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2025-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 8171 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2025-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9373661 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2025-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9373661 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2025-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 8150 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2025-12-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 8150 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2025-12-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9162257 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2025-12-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9162257 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2025-12-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 6965 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2026-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 6965 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2026-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9044953 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2026-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 9044953 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2026-03-30. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 5962 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2026-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 5962 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2026-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 8945640 and preferred label http://www.xbrl.org/2003/role/periodStartLabel, was not shown because there are no facts in a duration starting at 2026-06-29. Change the preferred label role or add facts.
WARNING
In "Statement of Changes in Partners' Capital", fact us-gaap:PartnersCapital with value 8945640 and preferred label http://www.xbrl.org/2003/role/periodEndLabel, was not shown because there are no facts in a duration ending at 2026-06-29. Change the preferred label role or add facts.
WARNING
us-gaap:PartnersCapital in context c11 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c12 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:ProfitLoss in context c14 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:ProfitLoss in context c15 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:PartnersCapital in context c17 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c18 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:ProfitLoss in context c20 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:ProfitLoss in context c21 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:PartnersCapital in context c23 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c24 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:ProfitLoss in context c26 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:ProfitLoss in context c27 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:PartnersCapital in context c28 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c29 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c30 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c31 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:ProfitLoss in context c33 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:ProfitLoss in context c34 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:PartnersCapital in context c36 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c37 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:ProfitLoss in context c39 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:ProfitLoss in context c40 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:PartnersCapital in context c42 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:PartnersCapital in context c43 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedBalanceSheet'}.
WARNING
us-gaap:ProfitLoss in context c45 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:GeneralPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
WARNING
us-gaap:ProfitLoss in context c46 was not selected in any presentation group. Ensure that its dimension members {'us-gaap:PartnerTypeOfPartnersCapitalAccountAxis': 'us-gaap:LimitedPartnerMember'} are presented in presentation roles {'http://aeifunds.com/role/ShareholdersEquityType2or3', 'http://aeifunds.com/role/ConsolidatedCashFlow', 'http://aeifunds.com/role/ConsolidatedIncomeStatement'}.
What are possible issues?
What are possible issues?
Indicate areas of interest as to the quality of an XBRL formatted filing, and in some cases reveal opportunities for improvement of the XBRL filing.