21626510055664 has 40 divisors (see below), whose sum is σ = 42075700921280. Its totient is φ = 10768331179008.

The previous prime is 21626510055629. The next prime is 21626510055737. The reversal of 21626510055664 is 46655001562612.

It is a super-2 number, since 2×21626510055664² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3125164 + ... + 7281460.

It is an arithmetic number, because the mean of its divisors is an integer number (1051892523032).

Almost surely, 2^{21626510055664} is an apocalyptic number.

It is an amenable number.

21626510055664 is a deficient number, since it is larger than the sum of its proper divisors (20449190865616).

21626510055664 is a wasteful number, since it uses less digits than its factorization.

21626510055664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4157657 (or 4157651 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 21626510055664 in words is "twenty-one trillion, six hundred twenty-six billion, five hundred ten million, fifty-five thousand, six hundred sixty-four".