21310320031 has 16 divisors (see below), whose sum is σ = 28612459008. Its totient is φ = 15328101600.

The previous prime is 21310319939. The next prime is 21310320091. The reversal of 21310320031 is 13002301312.

It is not a de Polignac number, because 21310320031 - 2¹³ = 21310311839 is a prime.

It is a super-2 number, since 2×21310320031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21310319987 and 21310320014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310320091) 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, 10643515 + ... + 10645516.

It is an arithmetic number, because the mean of its divisors is an integer number (1788278688).

Almost surely, 2^21310320031 is an apocalyptic number.

21310320031 is a deficient number, since it is larger than the sum of its proper divisors (7302138977).

21310320031 is a wasteful number, since it uses less digits than its factorization.

21310320031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21289062.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21310320031 its reverse (13002301312), we get a palindrome (34312621343).

The spelling of 21310320031 in words is "twenty-one billion, three hundred ten million, three hundred twenty thousand, thirty-one".