21111012112212 has 36 divisors (see below), whose sum is σ = 58215215219616. Its totient is φ = 6397276397520.

The previous prime is 21111012112133. The next prime is 21111012112213. The reversal of 21111012112212 is 21221121011112.

It is a happy number.

21111012112212 is a `hidden beast` number, since 211 + 110 + 121 + 1 + 221 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111012112213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26655317928 + ... + 26655318719.

It is an arithmetic number, because the mean of its divisors is an integer number (1617089311656).

Almost surely, 2^{21111012112212} is an apocalyptic number.

21111012112212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21111012112212 is an abundant number, since it is smaller than the sum of its proper divisors (37104203107404).

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

21111012112212 is a wasteful number, since it uses less digits than its factorization.

21111012112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53310636668 (or 53310636663 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21111012112212 its reverse (21221121011112), we get a palindrome (42332133123324).

The spelling of 21111012112212 in words is "twenty-one trillion, one hundred eleven billion, twelve million, one hundred twelve thousand, two hundred twelve".