21637343379055 has 32 divisors (see below), whose sum is σ = 26843801822208. Its totient is φ = 16733059728000.

The previous prime is 21637343379023. The next prime is 21637343379059. The reversal of 21637343379055 is 55097334373612.

It is not a de Polignac number, because 21637343379055 - 2⁵ = 21637343379023 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 (21637343379059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74969725 + ... + 75257785.

It is an arithmetic number, because the mean of its divisors is an integer number (838868806944).

Almost surely, 2^{21637343379055} is an apocalyptic number.

21637343379055 is a deficient number, since it is larger than the sum of its proper divisors (5206458443153).

21637343379055 is a wasteful number, since it uses less digits than its factorization.

21637343379055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292047.

The product of its (nonzero) digits is 42865200, while the sum is 58.

The spelling of 21637343379055 in words is "twenty-one trillion, six hundred thirty-seven billion, three hundred forty-three million, three hundred seventy-nine thousand, fifty-five".