<ARTICLE> 5 <CIK> 0000931755 <NAME> AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-2000 <PERIOD-END> MAR-31-2000 <CASH> 1,956,104 <SECURITIES> 0 <RECEIVABLES> 3,099 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 1,959,203 <PP&E> 17,305,589 <DEPRECIATION> (1,312,563) <TOTAL-ASSETS> 17,952,229 <CURRENT-LIABILITIES> 538,431 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 17,413,798 <TOTAL-LIABILITY-AND-EQUITY> 17,952,229 <SALES> 0 <TOTAL-REVENUES> 451,438 <CGS> 0 <TOTAL-COSTS> 216,656 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 234,782 <INCOME-TAX> 0 <INCOME-CONTINUING> 234,782 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 234,782 <EPS-BASIC> 9.87 <EPS-DILUTED> 9.87