253221369 has 4 divisors (see below), whose sum is σ = 337628496. Its totient is φ = 168814244.

The previous prime is 253221337. The next prime is 253221391. The reversal of 253221369 is 963122352.

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 253221369 - 2⁵ = 253221337 is a prime.

It is a super-2 number, since 2×253221369² = 128242123436468322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (253221469) 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, 42203559 + ... + 42203564.

It is an arithmetic number, because the mean of its divisors is an integer number (84407124).

Almost surely, 2^253221369 is an apocalyptic number.

It is an amenable number.

253221369 is a deficient number, since it is larger than the sum of its proper divisors (84407127).

253221369 is an equidigital number, since it uses as much as digits as its factorization.

253221369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84407126.

The product of its digits is 19440, while the sum is 33.

The square root of 253221369 is about 15912.9308739779. The cubic root of 253221369 is about 632.6547660871.

The spelling of 253221369 in words is "two hundred fifty-three million, two hundred twenty-one thousand, three hundred sixty-nine".