52520530021 has 4 divisors (see below), whose sum is σ = 52903891692. Its totient is φ = 52137168352.

The previous prime is 52520529991. The next prime is 52520530063. The reversal of 52520530021 is 12003502525.

It is a happy number.

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 42534525121 + 9986004900 = 206239^2 + 99930^2 .

It is a cyclic number.

It is not a de Polignac number, because 52520530021 - 2¹⁷ = 52520398949 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 (52520530921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191680630 + ... + 191680903.

It is an arithmetic number, because the mean of its divisors is an integer number (13225972923).

Almost surely, 2^52520530021 is an apocalyptic number.

It is an amenable number.

52520530021 is a deficient number, since it is larger than the sum of its proper divisors (383361671).

52520530021 is a wasteful number, since it uses less digits than its factorization.

52520530021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383361670.

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 52520530021 in words is "fifty-two billion, five hundred twenty million, five hundred thirty thousand, twenty-one".