231201021111312 has 160 divisors (see below), whose sum is σ = 696802290370560. Its totient is φ = 64690903756800.

The previous prime is 231201021111233. The next prime is 231201021111323. The reversal of 231201021111312 is 213111120102132.

It is a super-2 number, since 2×231201021111312² (a number of 30 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16958689 + ... + 27386112.

It is an arithmetic number, because the mean of its divisors is an integer number (4355014314816).

Almost surely, 2^{231201021111312} is an apocalyptic number.

It is an amenable number.

231201021111312 is an abundant number, since it is smaller than the sum of its proper divisors (465601269259248).

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

231201021111312 is a wasteful number, since it uses less digits than its factorization.

231201021111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44345141 (or 44345135 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 231201021111312 its reverse (213111120102132), we get a palindrome (444312141213444).

The spelling of 231201021111312 in words is "two hundred thirty-one trillion, two hundred one billion, twenty-one million, one hundred eleven thousand, three hundred twelve".