Hecho general: 21843 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 21843 is a boring number.
Trivia: 21843 is a boring number.
Fecha histórica: October 20th is the day in 1991 that the Oakland Hills firestorm kills 25 and destroys 3,469 homes and apartments, causing more than $2 billion in damage.