253221231 has 4 divisors (see below), whose sum is σ = 337628312. Its totient is φ = 168814152.

The previous prime is 253221223. The next prime is 253221247. The reversal of 253221231 is 132122352.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 253221231 - 2³ = 253221223 is a prime.

It is a super-2 number, since 2×253221231² = 128241983658310722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253221198 and 253221207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253221251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42203536 + ... + 42203541.

It is an arithmetic number, because the mean of its divisors is an integer number (84407078).

Almost surely, 2^253221231 is an apocalyptic number.

253221231 is a deficient number, since it is larger than the sum of its proper divisors (84407081).

253221231 is an equidigital number, since it uses as much as digits as its factorization.

253221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84407080.

The product of its digits is 720, while the sum is 21.

The square root of 253221231 is about 15912.9265378811. The cubic root of 253221231 is about 632.6546511595.

Adding to 253221231 its reverse (132122352), we get a palindrome (385343583).

The spelling of 253221231 in words is "two hundred fifty-three million, two hundred twenty-one thousand, two hundred thirty-one".