General fact: 22016 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 22016 is an uninteresting number.
Trivia: 22016 is an uninteresting number.
Historical date: April 10th is the day in 1826 that the 10,500 inhabitants of the Greek town Missolonghi start leaving the town after a year's siege by Turkish forces.