253243421 has 2 divisors, whose sum is σ = 253243422. Its totient is φ = 253243420.

The previous prime is 253243411. The next prime is 253243447. The reversal of 253243421 is 124342352.

It is an a-pointer prime, because the next prime (253243447) can be obtained adding 253243421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211382521 + 41860900 = 14539^2 + 6470^2 .

It is a cyclic number.

It is not a de Polignac number, because 253243421 - 2⁶ = 253243357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253243411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126621710 + 126621711.

It is an arithmetic number, because the mean of its divisors is an integer number (126621711).

Almost surely, 2^253243421 is an apocalyptic number.

It is an amenable number.

253243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

253243421 is an equidigital number, since it uses as much as digits as its factorization.

253243421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 26.

The square root of 253243421 is about 15913.6237545067. The cubic root of 253243421 is about 632.6731306483.

Adding to 253243421 its reverse (124342352), we get a palindrome (377585773).

The spelling of 253243421 in words is "two hundred fifty-three million, two hundred forty-three thousand, four hundred twenty-one".