253005421 has 4 divisors (see below), whose sum is σ = 258889312. Its totient is φ = 247121532.

The previous prime is 253005317. The next prime is 253005439. The reversal of 253005421 is 124500352.

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 253005421 - 2⁷ = 253005293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253005392 and 253005401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253005481) 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, 2941881 + ... + 2941966.

It is an arithmetic number, because the mean of its divisors is an integer number (64722328).

Almost surely, 2^253005421 is an apocalyptic number.

It is an amenable number.

253005421 is a deficient number, since it is larger than the sum of its proper divisors (5883891).

253005421 is an equidigital number, since it uses as much as digits as its factorization.

253005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5883890.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 253005421 is about 15906.1441273490. The cubic root of 253005421 is about 632.4748715977.

Adding to 253005421 its reverse (124500352), we get a palindrome (377505773).

The spelling of 253005421 in words is "two hundred fifty-three million, five thousand, four hundred twenty-one".