53387434621 has 4 divisors (see below), whose sum is σ = 54629002912. Its totient is φ = 52145866332.

The previous prime is 53387434613. The next prime is 53387434679. The reversal of 53387434621 is 12643478335.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53387434621 - 2³ = 53387434613 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 (53387434691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620784081 + ... + 620784166.

It is an arithmetic number, because the mean of its divisors is an integer number (13657250728).

Almost surely, 2^53387434621 is an apocalyptic number.

It is an amenable number.

53387434621 is a deficient number, since it is larger than the sum of its proper divisors (1241568291).

53387434621 is a wasteful number, since it uses less digits than its factorization.

53387434621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241568290.

The product of its digits is 1451520, while the sum is 46.

The spelling of 53387434621 in words is "fifty-three billion, three hundred eighty-seven million, four hundred thirty-four thousand, six hundred twenty-one".