21662752631 has 8 divisors (see below), whose sum is σ = 23356935840. Its totient is φ = 19972543392.

The previous prime is 21662752619. The next prime is 21662752667. The reversal of 21662752631 is 13625726612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21662752631 is a prime.

It is a super-2 number, since 2×21662752631² (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 (21662752681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 982160 + ... + 1003973.

It is an arithmetic number, because the mean of its divisors is an integer number (2919616980).

Almost surely, 2^21662752631 is an apocalyptic number.

21662752631 is a deficient number, since it is larger than the sum of its proper divisors (1694183209).

21662752631 is a wasteful number, since it uses less digits than its factorization.

21662752631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986985.

The product of its digits is 181440, while the sum is 41.

The spelling of 21662752631 in words is "twenty-one billion, six hundred sixty-two million, seven hundred fifty-two thousand, six hundred thirty-one".