231511012012 has 48 divisors (see below), whose sum is σ = 470702095360. Its totient is φ = 97573896000.

The previous prime is 231511012003. The next prime is 231511012021. The reversal of 231511012012 is 210210115132.

It is an interprime number because it is at equal distance from previous prime (231511012003) and next prime (231511012021).

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, 12546289 + ... + 12564727.

Almost surely, 2^231511012012 is an apocalyptic number.

It is an amenable number.

231511012012 is an abundant number, since it is smaller than the sum of its proper divisors (239191083348).

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

231511012012 is a wasteful number, since it uses less digits than its factorization.

231511012012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25862 (or 25860 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 231511012012 its reverse (210210115132), we get a palindrome (441721127144).

The spelling of 231511012012 in words is "two hundred thirty-one billion, five hundred eleven million, twelve thousand, twelve".