51572384921 has 24 divisors (see below), whose sum is σ = 53439251040. Its totient is φ = 49755241536.

The previous prime is 51572384879. The next prime is 51572384933. The reversal of 51572384921 is 12948327515.

It is not a de Polignac number, because 51572384921 - 2²² = 51568190617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51572314921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83585405 + ... + 83586021.

It is an arithmetic number, because the mean of its divisors is an integer number (2226635460).

Almost surely, 2^51572384921 is an apocalyptic number.

It is an amenable number.

51572384921 is a deficient number, since it is larger than the sum of its proper divisors (1866866119).

51572384921 is an equidigital number, since it uses as much as digits as its factorization.

51572384921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 982 counting only the distinct ones).

The product of its digits is 604800, while the sum is 47.

The spelling of 51572384921 in words is "fifty-one billion, five hundred seventy-two million, three hundred eighty-four thousand, nine hundred twenty-one".