53002505821 has 4 divisors (see below), whose sum is σ = 53012796732. Its totient is φ = 52992214912.

The previous prime is 53002505813. The next prime is 53002505861. The reversal of 53002505821 is 12850520035.

53002505821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12850520035 = 5 ⋅2570104007.

It can be written as a sum of positive squares in 2 ways, for example, as 33025792900 + 19976712921 = 181730^2 + 141339^2 .

It is a cyclic number.

It is not a de Polignac number, because 53002505821 - 2³ = 53002505813 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 (53002505861) 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, 5137726 + ... + 5148031.

It is an arithmetic number, because the mean of its divisors is an integer number (13253199183).

Almost surely, 2^53002505821 is an apocalyptic number.

It is an amenable number.

53002505821 is a deficient number, since it is larger than the sum of its proper divisors (10290911).

53002505821 is a wasteful number, since it uses less digits than its factorization.

53002505821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290910.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 53002505821 in words is "fifty-three billion, two million, five hundred five thousand, eight hundred twenty-one".