21602417077644 has 96 divisors (see below), whose sum is σ = 60501172999680. Its totient is φ = 5926645490688.

The previous prime is 21602417077573. The next prime is 21602417077669. The reversal of 21602417077644 is 44677071420612.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214310344 + ... + 214411119.

It is an arithmetic number, because the mean of its divisors is an integer number (630220552080).

Almost surely, 2^{21602417077644} is an apocalyptic number.

It is an amenable number.

21602417077644 is an abundant number, since it is smaller than the sum of its proper divisors (38898755922036).

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

21602417077644 is a wasteful number, since it uses less digits than its factorization.

21602417077644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428721519 (or 428721517 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 51.

The spelling of 21602417077644 in words is "twenty-one trillion, six hundred two billion, four hundred seventeen million, seventy-seven thousand, six hundred forty-four".