21112112111212 has 6 divisors (see below), whose sum is σ = 36946196194628. Its totient is φ = 10556056055604.

The previous prime is 21112112111201. The next prime is 21112112111227. The reversal of 21112112111212 is 21211121121112.

It is a super-3 number, since 3×21112112111212³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21112112111212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639014013898 + ... + 2639014013905.

Almost surely, 2^{21112112111212} is an apocalyptic number.

It is an amenable number.

21112112111212 is a deficient number, since it is larger than the sum of its proper divisors (15834084083416).

21112112111212 is a wasteful number, since it uses less digits than its factorization.

21112112111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278028027807 (or 5278028027805 counting only the distinct ones).

The product of its digits is 32, while the sum is 19.

Adding to 21112112111212 its reverse (21211121121112), we get a palindrome (42323233232324).

The spelling of 21112112111212 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, one hundred eleven thousand, two hundred twelve".