20013767353721 has 16 divisors (see below), whose sum is σ = 21096570657600. Its totient is φ = 18957212584128.

The previous prime is 20013767353693. The next prime is 20013767353807. The reversal of 20013767353721 is 12735376731002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013767353721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013767353621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15452990 + ... + 16697976.

It is an arithmetic number, because the mean of its divisors is an integer number (1318535666100).

Almost surely, 2^{20013767353721} is an apocalyptic number.

It is an amenable number.

20013767353721 is a deficient number, since it is larger than the sum of its proper divisors (1082803303879).

20013767353721 is a wasteful number, since it uses less digits than its factorization.

20013767353721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255528.

The product of its (nonzero) digits is 1111320, while the sum is 47.

The spelling of 20013767353721 in words is "twenty trillion, thirteen billion, seven hundred sixty-seven million, three hundred fifty-three thousand, seven hundred twenty-one".