252412221 has 4 divisors (see below), whose sum is σ = 336549632. Its totient is φ = 168274812.

The previous prime is 252412217. The next prime is 252412253. The reversal of 252412221 is 122214252.

252412221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 252412221 - 2² = 252412217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252412271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42068701 + ... + 42068706.

It is an arithmetic number, because the mean of its divisors is an integer number (84137408).

Almost surely, 2^252412221 is an apocalyptic number.

It is an amenable number.

252412221 is a deficient number, since it is larger than the sum of its proper divisors (84137411).

252412221 is an equidigital number, since it uses as much as digits as its factorization.

252412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84137410.

The product of its digits is 640, while the sum is 21.

The square root of 252412221 is about 15887.4863021184. The cubic root of 252412221 is about 631.9801816744.

Adding to 252412221 its reverse (122214252), we get a palindrome (374626473).

The spelling of 252412221 in words is "two hundred fifty-two million, four hundred twelve thousand, two hundred twenty-one".