21211111111212 is a `hidden beast` number, since 21 + 211 + 111 + 111 + 212 = 666.
21211111111212 is nontrivially palindromic in base 10.
It is a nude number because it is divisible by every one of its digits.
Almost surely, 221211111111212 is an apocalyptic number.
21211111111212 is a gapful number since it is divisible by the number (22) 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.
21211111111212 is a wasteful number, since it uses less digits than its factorization.
21211111111212 is an evil number, because the sum of its binary digits is even.
The spelling of 21211111111212 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twelve".