It is a happy number.
It is a congruent number.
Almost surely, 212120211001112 is an apocalyptic number.
12120211001112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
12120211001112 is a wasteful number, since it uses less digits than its factorization.
12120211001112 is an odious number, because the sum of its binary digits is odd.
Adding to 12120211001112 its reverse (21110011202121), we get a palindrome (33230222203233).
The spelling of 12120211001112 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, one thousand, one hundred twelve".