52521524221 has 4 divisors (see below), whose sum is σ = 52533312732. Its totient is φ = 52509735712.

The previous prime is 52521524207. The next prime is 52521524273. The reversal of 52521524221 is 12242512525.

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 19428456996 + 33093067225 = 139386^2 + 181915^2 .

It is a cyclic number.

It is not a de Polignac number, because 52521524221 - 2³¹ = 50374040573 is a prime.

It is a super-3 number, since 3×52521524221³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52521524201) 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, 5887570 + ... + 5896483.

It is an arithmetic number, because the mean of its divisors is an integer number (13133328183).

Almost surely, 2^52521524221 is an apocalyptic number.

It is an amenable number.

52521524221 is a deficient number, since it is larger than the sum of its proper divisors (11788511).

52521524221 is a wasteful number, since it uses less digits than its factorization.

52521524221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11788510.

The product of its digits is 16000, while the sum is 31.

The spelling of 52521524221 in words is "fifty-two billion, five hundred twenty-one million, five hundred twenty-four thousand, two hundred twenty-one".