21031112312 has 32 divisors (see below), whose sum is σ = 47438601600. Its totient is φ = 8538947424.

The previous prime is 21031112303. The next prime is 21031112321. The reversal of 21031112312 is 21321113012.

It is an interprime number because it is at equal distance from previous prime (21031112303) and next prime (21031112321).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9881978 + ... + 9884105.

It is an arithmetic number, because the mean of its divisors is an integer number (1482456300).

Almost surely, 2^21031112312 is an apocalyptic number.

It is an amenable number.

21031112312 is an abundant number, since it is smaller than the sum of its proper divisors (26407489288).

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

21031112312 is a wasteful number, since it uses less digits than its factorization.

21031112312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19766115 (or 19766111 counting only the distinct ones).

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

Adding to 21031112312 its reverse (21321113012), we get a palindrome (42352225324).

The spelling of 21031112312 in words is "twenty-one billion, thirty-one million, one hundred twelve thousand, three hundred twelve".