20013055564421 has 32 divisors (see below), whose sum is σ = 23237344551168. Its totient is φ = 17122252815360.

The previous prime is 20013055564399. The next prime is 20013055564427. The reversal of 20013055564421 is 12446555031002.

It is not a de Polignac number, because 20013055564421 - 2¹⁸ = 20013055302277 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 (20013055564427) 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, 15463490 + ... + 16707651.

It is an arithmetic number, because the mean of its divisors is an integer number (726167017224).

Almost surely, 2^{20013055564421} is an apocalyptic number.

It is an amenable number.

20013055564421 is a deficient number, since it is larger than the sum of its proper divisors (3224288986747).

20013055564421 is a wasteful number, since it uses less digits than its factorization.

20013055564421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32171261.

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

The spelling of 20013055564421 in words is "twenty trillion, thirteen billion, fifty-five million, five hundred sixty-four thousand, four hundred twenty-one".