Hecho general: 21027 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 21027 is an unremarkable number.
Trivia: 21027 is a boring number.
Fecha histórica: July 26th is the day in 1953 that Fidel Castro leads an unsuccessful attack on the Moncada Barracks, thus beginning the Cuban Revolution.