Fatto generale: 28121 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 28121 is an uninteresting number.
Trivia: 28121 is a boring number.
Data storica: December 27th is the day in 1945 that the World Bank and International Monetary Fund are created with the signing of an agreement by 29 nations.