Fatto generale: 22331 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 22331 is an uninteresting number.
Trivia: 22331 is an uninteresting number.
Data storica: February 19th is the day in 2002 that NASA's Mars Odyssey space probe begins to map the surface of Mars using its thermal emission imaging system.