252102221 has 8 divisors (see below), whose sum is σ = 293000640. Its totient is φ = 212424768.

The previous prime is 252102217. The next prime is 252102223. The reversal of 252102221 is 122201252.

252102221 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 a cyclic number.

It is not a de Polignac number, because 252102221 - 2² = 252102217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252102223) 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, 304796 + ... + 305621.

It is an arithmetic number, because the mean of its divisors is an integer number (36625080).

Almost surely, 2^252102221 is an apocalyptic number.

It is an amenable number.

252102221 is a deficient number, since it is larger than the sum of its proper divisors (40898419).

252102221 is an equidigital number, since it uses as much as digits as its factorization.

252102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610483.

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

The square root of 252102221 is about 15877.7271988153. The cubic root of 252102221 is about 631.7213535900.

Adding to 252102221 its reverse (122201252), we get a palindrome (374303473).

It can be divided in two parts, 25 and 2102221, that multiplied together give a palindrome (52555525).

The spelling of 252102221 in words is "two hundred fifty-two million, one hundred two thousand, two hundred twenty-one".