21310031023 has 2 divisors, whose sum is σ = 21310031024. Its totient is φ = 21310031022.

The previous prime is 21310030999. The next prime is 21310031051. The reversal of 21310031023 is 32013001312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310031023 - 2²⁵ = 21276476591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310030988 and 21310031006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313031023) 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 as a sum of consecutive naturals, namely, 10655015511 + 10655015512.

It is an arithmetic number, because the mean of its divisors is an integer number (10655015512).

Almost surely, 2^21310031023 is an apocalyptic number.

21310031023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310031023 is an equidigital number, since it uses as much as digits as its factorization.

21310031023 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21310031023 its reverse (32013001312), we get a palindrome (53323032335).

The spelling of 21310031023 in words is "twenty-one billion, three hundred ten million, thirty-one thousand, twenty-three".