21310223231 has 16 divisors (see below), whose sum is σ = 24868801440. Its totient is φ = 18045358080.

The previous prime is 21310223177. The next prime is 21310223261. The reversal of 21310223231 is 13232201312.

It is a cyclic number.

It is not a de Polignac number, because 21310223231 - 2²⁶ = 21243114367 is a prime.

It is a super-2 number, since 2×21310223231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310223261) 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, 569276 + ... + 605553.

It is an arithmetic number, because the mean of its divisors is an integer number (1554300090).

Almost surely, 2^21310223231 is an apocalyptic number.

21310223231 is a deficient number, since it is larger than the sum of its proper divisors (3558578209).

21310223231 is a wasteful number, since it uses less digits than its factorization.

21310223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174954.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21310223231 its reverse (13232201312), we get a palindrome (34542424543).

The spelling of 21310223231 in words is "twenty-one billion, three hundred ten million, two hundred twenty-three thousand, two hundred thirty-one".