252420121 has 2 divisors, whose sum is σ = 252420122. Its totient is φ = 252420120.

The previous prime is 252420083. The next prime is 252420139. The reversal of 252420121 is 121024252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252015625 + 404496 = 15875^2 + 636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252420121 is a prime.

It is not a weakly prime, because it can be changed into another prime (252420151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126210060 + 126210061.

It is an arithmetic number, because the mean of its divisors is an integer number (126210061).

Almost surely, 2^252420121 is an apocalyptic number.

It is an amenable number.

252420121 is a deficient number, since it is larger than the sum of its proper divisors (1).

252420121 is an equidigital number, since it uses as much as digits as its factorization.

252420121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 252420121 is about 15887.7349235188. The cubic root of 252420121 is about 631.9867748461.

Adding to 252420121 its reverse (121024252), we get a palindrome (373444373).

The spelling of 252420121 in words is "two hundred fifty-two million, four hundred twenty thousand, one hundred twenty-one".