Hecho general: 21339 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 21339 is an unremarkable number.
Trivia: 21339 is a boring number.
Fecha histórica: June 3rd is the day in 1950 that First successful ascent of an Eight-thousander; Annapurna is summited by Maurice Herzog and Louis Lachenal.