Fait général: 21778 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21778 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 21778 is an uninteresting number.
Date historique: August 16th is the day in 1927 that the Dole Air Race begins from Oakland, California, to Honolulu, Hawaii, during which six out of the eight participating planes crash or disappear.