53255120021 has 4 divisors (see below), whose sum is σ = 55091503500. Its totient is φ = 51418736544.

The previous prime is 53255120011. The next prime is 53255120029. The reversal of 53255120021 is 12002155235.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33419496100 + 19835623921 = 182810^2 + 140839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53255120021 is a prime.

It is a super-2 number, since 2×53255120021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53255120029) 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, 918191696 + ... + 918191753.

It is an arithmetic number, because the mean of its divisors is an integer number (13772875875).

Almost surely, 2^53255120021 is an apocalyptic number.

It is an amenable number.

53255120021 is a deficient number, since it is larger than the sum of its proper divisors (1836383479).

53255120021 is a wasteful number, since it uses less digits than its factorization.

53255120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836383478.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 53255120021 its reverse (12002155235), we get a palindrome (65257275256).

The spelling of 53255120021 in words is "fifty-three billion, two hundred fifty-five million, one hundred twenty thousand, twenty-one".