253211321 has 4 divisors (see below), whose sum is σ = 276230544. Its totient is φ = 230192100.

The previous prime is 253211293. The next prime is 253211333. The reversal of 253211321 is 123112352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253211321 - 2¹⁰ = 253210297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253211293 and 253211302.

It is not an unprimeable number, because it can be changed into a prime (253211351) 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 3 ways as a sum of consecutive naturals, for example, 11509595 + ... + 11509616.

It is an arithmetic number, because the mean of its divisors is an integer number (69057636).

Almost surely, 2^253211321 is an apocalyptic number.

It is an amenable number.

253211321 is a deficient number, since it is larger than the sum of its proper divisors (23019223).

253211321 is a wasteful number, since it uses less digits than its factorization.

253211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23019222.

The product of its digits is 360, while the sum is 20.

The square root of 253211321 is about 15912.6151527648. The cubic root of 253211321 is about 632.6463979161.

Adding to 253211321 its reverse (123112352), we get a palindrome (376323673).

The spelling of 253211321 in words is "two hundred fifty-three million, two hundred eleven thousand, three hundred twenty-one".