23131021331 has 16 divisors (see below), whose sum is σ = 26082259200. Its totient is φ = 20332874400.

The previous prime is 23131021297. The next prime is 23131021351. The reversal of 23131021331 is 13312013132.

It is a cyclic number.

It is not a de Polignac number, because 23131021331 - 2²² = 23126827027 is a prime.

It is a super-2 number, since 2×23131021331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23131021351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252551 + ... + 331728.

It is an arithmetic number, because the mean of its divisors is an integer number (1630141200).

Almost surely, 2^23131021331 is an apocalyptic number.

23131021331 is a deficient number, since it is larger than the sum of its proper divisors (2951237869).

23131021331 is a wasteful number, since it uses less digits than its factorization.

23131021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584410.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 23131021331 its reverse (13312013132), we get a palindrome (36443034463).

The spelling of 23131021331 in words is "twenty-three billion, one hundred thirty-one million, twenty-one thousand, three hundred thirty-one".