21713369831 has 2 divisors, whose sum is σ = 21713369832. Its totient is φ = 21713369830.

The previous prime is 21713369813. The next prime is 21713369911. The reversal of 21713369831 is 13896331712.

Together with previous prime (21713369813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21713369831 - 2⁶ = 21713369767 is a prime.

It is a super-2 number, since 2×21713369831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21713369231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10856684915 + 10856684916.

It is an arithmetic number, because the mean of its divisors is an integer number (10856684916).

Almost surely, 2^21713369831 is an apocalyptic number.

21713369831 is a deficient number, since it is larger than the sum of its proper divisors (1).

21713369831 is an equidigital number, since it uses as much as digits as its factorization.

21713369831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The spelling of 21713369831 in words is "twenty-one billion, seven hundred thirteen million, three hundred sixty-nine thousand, eight hundred thirty-one".