General fact: 21430 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 21430 is a boring number.
Trivia: 21430 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: September 2nd is the day in 421 that Emperor Constantius III dies suddenly of an illness, his wife Galla Placidia becomes for the second time widow.