52221221 has 8 divisors (see below), whose sum is σ = 57546720. Its totient is φ = 47082672.

The previous prime is 52221209. The next prime is 52221241. The reversal of 52221221 is 12212225.

52221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 52221221 - 2⁶ = 52221157 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 52221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52221241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46151 + ... + 47268.

It is an arithmetic number, because the mean of its divisors is an integer number (7193340).

Almost surely, 2^52221221 is an apocalyptic number.

It is an amenable number.

52221221 is a deficient number, since it is larger than the sum of its proper divisors (5325499).

52221221 is a wasteful number, since it uses less digits than its factorization.

52221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93475.

The product of its digits is 160, while the sum is 17.

The square root of 52221221 is about 7226.4251881549. The cubic root of 52221221 is about 373.7796680438.

Adding to 52221221 its reverse (12212225), we get a palindrome (64433446).

The spelling of 52221221 in words is "fifty-two million, two hundred twenty-one thousand, two hundred twenty-one".