253006021 has 2 divisors, whose sum is σ = 253006022. Its totient is φ = 253006020.

The previous prime is 253006009. The next prime is 253006057. The reversal of 253006021 is 120600352.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246929796 + 6076225 = 15714^2 + 2465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253006021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 253006021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253006001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126503010 + 126503011.

It is an arithmetic number, because the mean of its divisors is an integer number (126503011).

Almost surely, 2^253006021 is an apocalyptic number.

It is an amenable number.

253006021 is a deficient number, since it is larger than the sum of its proper divisors (1).

253006021 is an equidigital number, since it uses as much as digits as its factorization.

253006021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 253006021 is about 15906.1629879742. The cubic root of 253006021 is about 632.4753715668.

Adding to 253006021 its reverse (120600352), we get a palindrome (373606373).

The spelling of 253006021 in words is "two hundred fifty-three million, six thousand, twenty-one".