253912421 has 4 divisors (see below), whose sum is σ = 290185632. Its totient is φ = 217639212.

The previous prime is 253912403. The next prime is 253912427. The reversal of 253912421 is 124219352.

253912421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 253912421 - 2²⁶ = 186803557 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 (253912427) 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, 18136595 + ... + 18136608.

It is an arithmetic number, because the mean of its divisors is an integer number (72546408).

Almost surely, 2^253912421 is an apocalyptic number.

It is an amenable number.

253912421 is a deficient number, since it is larger than the sum of its proper divisors (36273211).

253912421 is an equidigital number, since it uses as much as digits as its factorization.

253912421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36273210.

The product of its digits is 4320, while the sum is 29.

The square root of 253912421 is about 15934.6296160281. The cubic root of 253912421 is about 633.2297573618.

The spelling of 253912421 in words is "two hundred fifty-three million, nine hundred twelve thousand, four hundred twenty-one".