252441421 has 2 divisors, whose sum is σ = 252441422. Its totient is φ = 252441420.

The previous prime is 252441407. The next prime is 252441437. The reversal of 252441421 is 124144252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238084900 + 14356521 = 15430^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 252441421 - 2⁵ = 252441389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252441451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126220710 + 126220711.

It is an arithmetic number, because the mean of its divisors is an integer number (126220711).

Almost surely, 2^252441421 is an apocalyptic number.

It is an amenable number.

252441421 is a deficient number, since it is larger than the sum of its proper divisors (1).

252441421 is an equidigital number, since it uses as much as digits as its factorization.

252441421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 25.

The square root of 252441421 is about 15888.4052377827. The cubic root of 252441421 is about 632.0045506869.

Adding to 252441421 its reverse (124144252), we get a palindrome (376585673).

The spelling of 252441421 in words is "two hundred fifty-two million, four hundred forty-one thousand, four hundred twenty-one".