21631064663 has 16 divisors (see below), whose sum is σ = 24074408736. Its totient is φ = 19307688960.

The previous prime is 21631064659. The next prime is 21631064677. The reversal of 21631064663 is 36646013612.

It is a cyclic number.

It is not a de Polignac number, because 21631064663 - 2² = 21631064659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631064603) 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 in 15 ways as a sum of consecutive naturals, for example, 119345 + ... + 239802.

It is an arithmetic number, because the mean of its divisors is an integer number (1504650546).

Almost surely, 2^21631064663 is an apocalyptic number.

21631064663 is a deficient number, since it is larger than the sum of its proper divisors (2443344073).

21631064663 is a wasteful number, since it uses less digits than its factorization.

21631064663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359314.

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 21631064663 in words is "twenty-one billion, six hundred thirty-one million, sixty-four thousand, six hundred sixty-three".