21012331112 has 16 divisors (see below), whose sum is σ = 39840797700. Its totient is φ = 10388118400.

The previous prime is 21012331111. The next prime is 21012331133. The reversal of 21012331112 is 21113321012.

It can be written as a sum of positive squares in 2 ways, for example, as 20353587556 + 658743556 = 142666^2 + 25666^2 .

It is not an unprimeable number, because it can be changed into a prime (21012331111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14755139 + ... + 14756562.

Almost surely, 2^21012331112 is an apocalyptic number.

It is an amenable number.

21012331112 is a deficient number, since it is larger than the sum of its proper divisors (18828466588).

21012331112 is a wasteful number, since it uses less digits than its factorization.

21012331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29511796 (or 29511792 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21012331112 its reverse (21113321012), we get a palindrome (42125652124).

The spelling of 21012331112 in words is "twenty-one billion, twelve million, three hundred thirty-one thousand, one hundred twelve".