253241021 has 12 divisors (see below), whose sum is σ = 287958300. Its totient is φ = 222277440.

The previous prime is 253241011. The next prime is 253241041. The reversal of 253241021 is 120142352.

It can be written as a sum of positive squares in 2 ways, for example, as 64480900 + 188760121 = 8030^2 + 13739^2 .

It is not a de Polignac number, because 253241021 - 2⁶ = 253240957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 253240984 and 253241002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253241011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32576 + ... + 39593.

It is an arithmetic number, because the mean of its divisors is an integer number (23996525).

Almost surely, 2^253241021 is an apocalyptic number.

It is an amenable number.

253241021 is a deficient number, since it is larger than the sum of its proper divisors (34717279).

253241021 is a wasteful number, since it uses less digits than its factorization.

253241021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72220 (or 72209 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 253241021 is about 15913.5483472417. The cubic root of 253241021 is about 632.6711320175.

Adding to 253241021 its reverse (120142352), we get a palindrome (373383373).

The spelling of 253241021 in words is "two hundred fifty-three million, two hundred forty-one thousand, twenty-one".