20437473364521 has 16 divisors (see below), whose sum is σ = 27273994259520. Its totient is φ = 13612968008640.

The previous prime is 20437473364471. The next prime is 20437473364579. The reversal of 20437473364521 is 12546337473402.

It is not a de Polignac number, because 20437473364521 - 2⁶ = 20437473364457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20437473366521) 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, 188991015 + ... + 189099123.

It is an arithmetic number, because the mean of its divisors is an integer number (1704624641220).

Almost surely, 2^{20437473364521} is an apocalyptic number.

It is an amenable number.

20437473364521 is a deficient number, since it is larger than the sum of its proper divisors (6836520894999).

20437473364521 is a wasteful number, since it uses less digits than its factorization.

20437473364521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163096.

The product of its (nonzero) digits is 10160640, while the sum is 51.

The spelling of 20437473364521 in words is "twenty trillion, four hundred thirty-seven billion, four hundred seventy-three million, three hundred sixty-four thousand, five hundred twenty-one".