21112012222112 has 72 divisors (see below), whose sum is σ = 48472068533364. Its totient is φ = 9025214026752.

The previous prime is 21112012222087. The next prime is 21112012222123. The reversal of 21112012222112 is 21122221021112.

It can be written as a sum of positive squares in 2 ways, for example, as 20940910863376 + 171101358736 = 4576124^2 + 413644^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16335053 + ... + 17580044.

Almost surely, 2^{21112012222112} is an apocalyptic number.

It is an amenable number.

21112012222112 is an abundant number, since it is smaller than the sum of its proper divisors (27360056311252).

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

21112012222112 is a wasteful number, since it uses less digits than its factorization.

21112012222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33915518 (or 33915503 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112012222112 its reverse (21122221021112), we get a palindrome (42234233243224).

The spelling of 21112012222112 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-two thousand, one hundred twelve".