Fatto generale: 54101 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 54101 is an unremarkable number.
Trivia: 54101 is an unremarkable number.
Data storica: February 14th is the day in 2002 that the Budapest Open Access Initiative, one of the cornerstones of the Open access movement, was released to the public.