Fait général: 21924 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21924 is a boring number.
Culture générale: 21924 is an uninteresting number.
Date historique: January 9th is the day in 1992 that the Assembly of the Serb People in Bosnia and Herzegovina proclaims the creation of Republika Srpska, a new state within Yugoslavia.