253324021 has 8 divisors (see below), whose sum is σ = 268381080. Its totient is φ = 238284288.

The previous prime is 253324013. The next prime is 253324037. The reversal of 253324021 is 120423352.

It can be written as a sum of positive squares in 4 ways, for example, as 37380996 + 215943025 = 6114^2 + 14695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253324021 - 2³ = 253324013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253323983 and 253324001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253324061) 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 in 7 ways as a sum of consecutive naturals, for example, 37275 + ... + 43543.

It is an arithmetic number, because the mean of its divisors is an integer number (33547635).

Almost surely, 2^253324021 is an apocalyptic number.

It is an amenable number.

253324021 is a deficient number, since it is larger than the sum of its proper divisors (15057059).

253324021 is a wasteful number, since it uses less digits than its factorization.

253324021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8663.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 253324021 is about 15916.1559743551. The cubic root of 253324021 is about 632.7402440013.

Adding to 253324021 its reverse (120423352), we get a palindrome (373747373).

The spelling of 253324021 in words is "two hundred fifty-three million, three hundred twenty-four thousand, twenty-one".