21310531023 has 16 divisors (see below), whose sum is σ = 28979065440. Its totient is φ = 13925044224.

The previous prime is 21310530971. The next prime is 21310531049. The reversal of 21310531023 is 32013501312.

It is not a de Polignac number, because 21310531023 - 2²² = 21306336719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310531093) 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, 94015 + ... + 226847.

It is an arithmetic number, because the mean of its divisors is an integer number (1811191590).

Almost surely, 2^21310531023 is an apocalyptic number.

21310531023 is a deficient number, since it is larger than the sum of its proper divisors (7668534417).

21310531023 is a wasteful number, since it uses less digits than its factorization.

21310531023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133898.

The product of its (nonzero) digits is 540, while the sum is 21.

The spelling of 21310531023 in words is "twenty-one billion, three hundred ten million, five hundred thirty-one thousand, twenty-three".