52320221 has 4 divisors (see below), whose sum is σ = 52719744. Its totient is φ = 51920700.

The previous prime is 52320181. The next prime is 52320227. The reversal of 52320221 is 12202325.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52320221 - 2¹⁴ = 52303837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 52320221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52320227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199565 + ... + 199826.

It is an arithmetic number, because the mean of its divisors is an integer number (13179936).

Almost surely, 2^52320221 is an apocalyptic number.

It is an amenable number.

52320221 is a deficient number, since it is larger than the sum of its proper divisors (399523).

52320221 is a wasteful number, since it uses less digits than its factorization.

52320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399522.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 52320221 is about 7233.2718046538. The cubic root of 52320221 is about 374.0157204064.

Adding to 52320221 its reverse (12202325), we get a palindrome (64522546).

The spelling of 52320221 in words is "fifty-two million, three hundred twenty thousand, two hundred twenty-one".