253434421 has 4 divisors (see below), whose sum is σ = 254635744. Its totient is φ = 252233100.

The previous prime is 253434413. The next prime is 253434457. The reversal of 253434421 is 124434352.

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 253434421 - 2³ = 253434413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253434421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253434491) 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, 600345 + ... + 600766.

It is an arithmetic number, because the mean of its divisors is an integer number (63658936).

Almost surely, 2^253434421 is an apocalyptic number.

It is an amenable number.

253434421 is a deficient number, since it is larger than the sum of its proper divisors (1201323).

253434421 is a wasteful number, since it uses less digits than its factorization.

253434421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201322.

The product of its digits is 11520, while the sum is 28.

The square root of 253434421 is about 15919.6237706800. The cubic root of 253434421 is about 632.8321478767.

Adding to 253434421 its reverse (124434352), we get a palindrome (377868773).

The spelling of 253434421 in words is "two hundred fifty-three million, four hundred thirty-four thousand, four hundred twenty-one".