Fait général: 21051 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21051 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 21051 is an unremarkable number.
Date historique: August 19th is the day in 1927 that Metropolitan Sergius proclaims the declaration of loyalty of the Russian Orthodox Church to the Soviet Union.