21620542012444 has 12 divisors (see below), whose sum is σ = 37840343511600. Its totient is φ = 10809015294848.

The previous prime is 21620542012429. The next prime is 21620542012493. The reversal of 21620542012444 is 44421024502612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313889104 + ... + 313957975.

It is an arithmetic number, because the mean of its divisors is an integer number (3153361959300).

Almost surely, 2^{21620542012444} is an apocalyptic number.

It is an amenable number.

21620542012444 is a deficient number, since it is larger than the sum of its proper divisors (16219801499156).

21620542012444 is a wasteful number, since it uses less digits than its factorization.

21620542012444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627855692 (or 627855690 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 37.

The spelling of 21620542012444 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-two million, twelve thousand, four hundred forty-four".