23031220031 has 4 divisors (see below), whose sum is σ = 23036601672. Its totient is φ = 23025838392.

The previous prime is 23031220021. The next prime is 23031220097. The reversal of 23031220031 is 13002213032.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23031220031 - 2²² = 23027025727 is a prime.

It is a super-2 number, since 2×23031220031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23031219991 and 23031220009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23031220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2684396 + ... + 2692961.

It is an arithmetic number, because the mean of its divisors is an integer number (5759150418).

Almost surely, 2^23031220031 is an apocalyptic number.

23031220031 is a deficient number, since it is larger than the sum of its proper divisors (5381641).

23031220031 is an equidigital number, since it uses as much as digits as its factorization.

23031220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381640.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 23031220031 its reverse (13002213032), we get a palindrome (36033433063).

The spelling of 23031220031 in words is "twenty-three billion, thirty-one million, two hundred twenty thousand, thirty-one".