21630651270761 has 16 divisors (see below), whose sum is σ = 23698974936000. Its totient is φ = 19620377368128.

The previous prime is 21630651270737. The next prime is 21630651270793. The reversal of 21630651270761 is 16707215603612.

It is a cyclic number.

It is not a de Polignac number, because 21630651270761 - 2³⁸ = 21355773363817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21630651270731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3823586 + ... + 7607963.

It is an arithmetic number, because the mean of its divisors is an integer number (1481185933500).

Almost surely, 2^{21630651270761} is an apocalyptic number.

It is an amenable number.

21630651270761 is a deficient number, since it is larger than the sum of its proper divisors (2068323665239).

21630651270761 is a wasteful number, since it uses less digits than its factorization.

21630651270761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11434088.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 21630651270761 in words is "twenty-one trillion, six hundred thirty billion, six hundred fifty-one million, two hundred seventy thousand, seven hundred sixty-one".