General fact: 21268 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 21268 is a boring number.
Trivia: 21268 is an uninteresting number.
Historical date: March 24th is the day in 1900 that Mayor of New York City Robert Anderson Van Wyck breaks ground for a new underground "Rapid Transit Railroad" that would link Manhattan and Brooklyn.