Hecho matemático: 91421 is an unremarkable number.
Trivia: 91421 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: April 20th is the day in 1770 that the Georgian king Erekle II, abandoned by his Russian ally Count Totleben, wins a victory over Ottoman forces at Aspindza.