Fait général: 21521 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21521 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 21521 is a boring number.
Date historique: December 2nd is the day in 1999 that the United Kingdom devolves political power in Northern Ireland to the Northern Ireland Executive.