Hecho general: 51022 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 51022 is an unremarkable number.
Trivia: 51022 is a boring number.
Fecha histórica: September 10th is the day in 1932 that the New York City Subway's third competing subway system, the municipally-owned IND, is opened.