21660792631 has 2 divisors, whose sum is σ = 21660792632. Its totient is φ = 21660792630.

The previous prime is 21660792619. The next prime is 21660792649. The reversal of 21660792631 is 13629706612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21660792631 - 2¹⁷ = 21660661559 is a prime.

It is a super-2 number, since 2×21660792631² (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 (21660792931) 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, 10830396315 + 10830396316.

It is an arithmetic number, because the mean of its divisors is an integer number (10830396316).

Almost surely, 2^21660792631 is an apocalyptic number.

21660792631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21660792631 is an equidigital number, since it uses as much as digits as its factorization.

21660792631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 21660792631 in words is "twenty-one billion, six hundred sixty million, seven hundred ninety-two thousand, six hundred thirty-one".