Fait général: 21836 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 21836 is an uninteresting number.
Culture générale: 21836 is an uninteresting number.
Date historique: October 13th is the day in 1845 that a majority of voters in the Republic of Texas approve a proposed constitution, that if accepted by the U.S. Congress, will make Texas a U.S. state.