231312033012 has 48 divisors (see below), whose sum is σ = 546633626112. Its totient is φ = 76118874720.

The previous prime is 231312032983. The next prime is 231312033041. The reversal of 231312033012 is 210330213132.

It is an interprime number because it is at equal distance from previous prime (231312032983) and next prime (231312033041).

It is a super-2 number, since 2×231312033012² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231312033012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1276587 + ... + 1446477.

It is an arithmetic number, because the mean of its divisors is an integer number (11388200544).

Almost surely, 2^231312033012 is an apocalyptic number.

It is an amenable number.

231312033012 is an abundant number, since it is smaller than the sum of its proper divisors (315321593100).

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

231312033012 is a wasteful number, since it uses less digits than its factorization.

231312033012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171348 (or 171346 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 231312033012 its reverse (210330213132), we get a palindrome (441642246144).

The spelling of 231312033012 in words is "two hundred thirty-one billion, three hundred twelve million, thirty-three thousand, twelve".