Fait général: 21980 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21980 is an uninteresting number.
Culture générale: 21980 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: March 5th is the day in 1046 that Naser Khosrow begins the seven-year Middle Eastern journey which he will later describe in his book Safarnama.