Fait général: 21655 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21655 is an unremarkable number.
Culture générale: 21655 is an uninteresting number.
Date historique: April 15th is the day in 1992 that the National Assembly of Vietnam adopts the 1992 Constitution of the Socialist Republic of Vietnam.