21726077161644 has 72 divisors (see below), whose sum is σ = 55052220760992. Its totient is φ = 7224439242240.

The previous prime is 21726077161597. The next prime is 21726077161667. The reversal of 21726077161644 is 44616177062712.

21726077161644 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 607 + 7 + 16 + 16 + 4 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24073377 + ... + 24959559.

It is an arithmetic number, because the mean of its divisors is an integer number (764614177236).

Almost surely, 2^{21726077161644} is an apocalyptic number.

It is an amenable number.

21726077161644 is an abundant number, since it is smaller than the sum of its proper divisors (33326143599348).

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

21726077161644 is a wasteful number, since it uses less digits than its factorization.

21726077161644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887847 (or 887842 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 21726077161644 in words is "twenty-one trillion, seven hundred twenty-six billion, seventy-seven million, one hundred sixty-one thousand, six hundred forty-four".