252426221 has 2 divisors, whose sum is σ = 252426222. Its totient is φ = 252426220.

The previous prime is 252426193. The next prime is 252426271. The reversal of 252426221 is 122624252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246050596 + 6375625 = 15686^2 + 2525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252426221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252426271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126213110 + 126213111.

It is an arithmetic number, because the mean of its divisors is an integer number (126213111).

Almost surely, 2^252426221 is an apocalyptic number.

It is an amenable number.

252426221 is a deficient number, since it is larger than the sum of its proper divisors (1).

252426221 is an equidigital number, since it uses as much as digits as its factorization.

252426221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 26.

The square root of 252426221 is about 15887.9268943434. The cubic root of 252426221 is about 631.9918656820.

The spelling of 252426221 in words is "two hundred fifty-two million, four hundred twenty-six thousand, two hundred twenty-one".