50505720921 has 12 divisors (see below), whose sum is σ = 72954743472. Its totient is φ = 33669541176.

The previous prime is 50505720913. The next prime is 50505720931. The reversal of 50505720921 is 12902750505.

It is not a de Polignac number, because 50505720921 - 2³ = 50505720913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (50505720931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 449410 + ... + 550436.

It is an arithmetic number, because the mean of its divisors is an integer number (6079561956).

Almost surely, 2^50505720921 is an apocalyptic number.

It is an amenable number.

50505720921 is a deficient number, since it is larger than the sum of its proper divisors (22449022551).

50505720921 is a wasteful number, since it uses less digits than its factorization.

50505720921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156580 (or 156577 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The spelling of 50505720921 in words is "fifty billion, five hundred five million, seven hundred twenty thousand, nine hundred twenty-one".