Hecho general: 5100 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 5100 is divisible by its reverse.
Trivia: 5100 is an uninteresting number.
Fecha histórica: December 17th is the day in 1957 that the United States successfully launches the first Atlas intercontinental ballistic missile at Cape Canaveral, Florida.