Fatto generale: 21472 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 21472 is an unremarkable number.
Trivia: 21472 is an unremarkable number.
Data storica: October 14th is the day in 1981 that Vice President Hosni Mubarak is elected as the President of Egypt one week after the assassination of the President of Egypt, Anwar Sadat.