Fatto generale: 2112 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2112 is the number of subsets of {1, 1/2, 1/3, ... 1/36} that sum to an integer.
Trivia: 2112 is an unremarkable number.
Data storica: October 12th is the day in 2005 that the second Chinese human spaceflight Shenzhou 6 launched carrying Fèi Jùnlóng and Niè Hǎishèng for five days in orbit.