21620505024560 has 80 divisors (see below), whose sum is σ = 54466531773024. Its totient is φ = 7933980450816.

The previous prime is 21620505024557. The next prime is 21620505024589. The reversal of 21620505024560 is 6542050502612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63600257 + ... + 63939296.

Almost surely, 2^{21620505024560} is an apocalyptic number.

21620505024560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21620505024560 is an abundant number, since it is smaller than the sum of its proper divisors (32846026748464).

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

21620505024560 is a wasteful number, since it uses less digits than its factorization.

21620505024560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127539742 (or 127539736 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 21620505024560 in words is "twenty-one trillion, six hundred twenty billion, five hundred five million, twenty-four thousand, five hundred sixty".