Fatto generale: 12453 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 12453 is an uninteresting number.
Trivia: 12453 is an uninteresting number.
Data storica: February 3rd is the day in 1995 that Astronaut Eileen Collins becomes the first woman to pilot the Space Shuttle as mission STS-63 gets underway from Kennedy Space Center in Florida.