252321221 has 4 divisors (see below), whose sum is σ = 252733452. Its totient is φ = 251908992.

The previous prime is 252321211. The next prime is 252321227. The reversal of 252321221 is 122123252.

252321221 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.

It can be written as a sum of positive squares in 2 ways, for example, as 88096996 + 164224225 = 9386^2 + 12815^2 .

It is a cyclic number.

It is not a de Polignac number, because 252321221 - 2¹⁰ = 252320197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 252321193 and 252321202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252321227) 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, 205196 + ... + 206421.

It is an arithmetic number, because the mean of its divisors is an integer number (63183363).

Almost surely, 2^252321221 is an apocalyptic number.

It is an amenable number.

252321221 is a deficient number, since it is larger than the sum of its proper divisors (412231).

252321221 is an equidigital number, since it uses as much as digits as its factorization.

252321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412230.

The product of its digits is 480, while the sum is 20.

The square root of 252321221 is about 15884.6221547760. The cubic root of 252321221 is about 631.9042250918.

Adding to 252321221 its reverse (122123252), we get a palindrome (374444473).

The spelling of 252321221 in words is "two hundred fifty-two million, three hundred twenty-one thousand, two hundred twenty-one".