231312032112 has 160 divisors (see below), whose sum is σ = 701063700480. Its totient is φ = 64343381760.

The previous prime is 231312032089. The next prime is 231312032113. The reversal of 231312032112 is 211230213132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312032113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4467589 + ... + 4519067.

It is an arithmetic number, because the mean of its divisors is an integer number (4381648128).

Almost surely, 2^231312032112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231312032112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350531850240).

231312032112 is an abundant number, since it is smaller than the sum of its proper divisors (469751668368).

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

231312032112 is a wasteful number, since it uses less digits than its factorization.

231312032112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51851 (or 51845 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 231312032112 its reverse (211230213132), we get a palindrome (442542245244).

The spelling of 231312032112 in words is "two hundred thirty-one billion, three hundred twelve million, thirty-two thousand, one hundred twelve".