21112112220012 has 72 divisors (see below), whose sum is σ = 58221104432400. Its totient is φ = 6397295963520.

The previous prime is 21112112219963. The next prime is 21112112220037. The reversal of 21112112220012 is 21002221121112.

21112112220012 is a `hidden beast` number, since 211 + 121 + 122 + 200 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6840178 + ... + 9434630.

It is an arithmetic number, because the mean of its divisors is an integer number (808626450450).

Almost surely, 2^{21112112220012} is an apocalyptic number.

21112112220012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21112112220012 is an abundant number, since it is smaller than the sum of its proper divisors (37108992212388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112112220012 is a wasteful number, since it uses less digits than its factorization.

21112112220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615023 (or 2615018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112112220012 its reverse (21002221121112), we get a palindrome (42114333341124).

The spelling of 21112112220012 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, two hundred twenty thousand, twelve".