253404221 has 4 divisors (see below), whose sum is σ = 289604832. Its totient is φ = 217203612.

The previous prime is 253404209. The next prime is 253404269. The reversal of 253404221 is 122404352.

It is a happy number.

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 253404221 - 2¹⁰ = 253403197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253404521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18100295 + ... + 18100308.

It is an arithmetic number, because the mean of its divisors is an integer number (72401208).

Almost surely, 2^253404221 is an apocalyptic number.

It is an amenable number.

253404221 is a deficient number, since it is larger than the sum of its proper divisors (36200611).

253404221 is an equidigital number, since it uses as much as digits as its factorization.

253404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36200610.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 253404221 is about 15918.6752275433. The cubic root of 253404221 is about 632.8070101573.

Adding to 253404221 its reverse (122404352), we get a palindrome (375808573).

The spelling of 253404221 in words is "two hundred fifty-three million, four hundred four thousand, two hundred twenty-one".