231133431321 has 24 divisors (see below), whose sum is σ = 361032808136. Its totient is φ = 141645749760.

The previous prime is 231133431317. The next prime is 231133431407. The reversal of 231133431321 is 123134331132.

231133431321 is a `hidden beast` number, since 2 + 3 + 1 + 1 + 334 + 3 + 1 + 321 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 99556025625 + 131577405696 = 315525^2 + 362736^2 .

It is not a de Polignac number, because 231133431321 - 2² = 231133431317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231133431121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4070350 + ... + 4126743.

Almost surely, 2^231133431321 is an apocalyptic number.

It is an amenable number.

231133431321 is a deficient number, since it is larger than the sum of its proper divisors (129899376815).

231133431321 is a wasteful number, since it uses less digits than its factorization.

231133431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8197353 (or 8197350 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

Adding to 231133431321 its reverse (123134331132), we get a palindrome (354267762453).

The spelling of 231133431321 in words is "two hundred thirty-one billion, one hundred thirty-three million, four hundred thirty-one thousand, three hundred twenty-one".