21626510055644 has 96 divisors (see below), whose sum is σ = 43603134515136. Its totient is φ = 9297280512000.

The previous prime is 21626510055629. The next prime is 21626510055737. The reversal of 21626510055644 is 44655001562612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34525382 + ... + 35146194.

It is an arithmetic number, because the mean of its divisors is an integer number (454199317866).

Almost surely, 2^{21626510055644} is an apocalyptic number.

It is an amenable number.

21626510055644 is an abundant number, since it is smaller than the sum of its proper divisors (21976624459492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21626510055644 is a wasteful number, since it uses less digits than its factorization.

21626510055644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621255 (or 621253 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 21626510055644 in words is "twenty-one trillion, six hundred twenty-six billion, five hundred ten million, fifty-five thousand, six hundred forty-four".