52207450251821 has 4 divisors (see below), whose sum is σ = 52207502374044. Its totient is φ = 52207398129600.

The previous prime is 52207450251731. The next prime is 52207450251823. The reversal of 52207450251821 is 12815205470225.

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 33547426176196 + 18660024075625 = 5792014^2 + 4319725^2 .

It is a cyclic number.

It is not a de Polignac number, because 52207450251821 - 2³⁰ = 52206376509997 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 (52207450251823) 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, 24528620 + ... + 26571941.

It is an arithmetic number, because the mean of its divisors is an integer number (13051875593511).

Almost surely, 2^{52207450251821} is an apocalyptic number.

It is an amenable number.

52207450251821 is a deficient number, since it is larger than the sum of its proper divisors (52122223).

52207450251821 is a wasteful number, since it uses less digits than its factorization.

52207450251821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52122222.

The product of its (nonzero) digits is 448000, while the sum is 44.

The spelling of 52207450251821 in words is "fifty-two trillion, two hundred seven billion, four hundred fifty million, two hundred fifty-one thousand, eight hundred twenty-one".