52521352221 has 8 divisors (see below), whose sum is σ = 75415275040. Its totient is φ = 32320832112.

The previous prime is 52521352199. The next prime is 52521352229. The reversal of 52521352221 is 12225312525.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 52521352221 - 2⁶ = 52521352157 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 (52521352229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673350631 + ... + 673350708.

It is an arithmetic number, because the mean of its divisors is an integer number (9426909380).

Almost surely, 2^52521352221 is an apocalyptic number.

It is an amenable number.

52521352221 is a deficient number, since it is larger than the sum of its proper divisors (22893922819).

52521352221 is a wasteful number, since it uses less digits than its factorization.

52521352221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346701355.

The product of its digits is 12000, while the sum is 30.

Adding to 52521352221 its reverse (12225312525), we get a palindrome (64746664746).

The spelling of 52521352221 in words is "fifty-two billion, five hundred twenty-one million, three hundred fifty-two thousand, two hundred twenty-one".