253872301921 has 4 divisors (see below), whose sum is σ = 290139773632. Its totient is φ = 217604830212.

The previous prime is 253872301913. The next prime is 253872301931. The reversal of 253872301921 is 129103278352.

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 253872301921 - 2³ = 253872301913 is a prime.

It is a super-2 number, since 2×253872301921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253872301931) 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, 18133735845 + ... + 18133735858.

It is an arithmetic number, because the mean of its divisors is an integer number (72534943408).

Almost surely, 2^253872301921 is an apocalyptic number.

It is an amenable number.

253872301921 is a deficient number, since it is larger than the sum of its proper divisors (36267471711).

253872301921 is an equidigital number, since it uses as much as digits as its factorization.

253872301921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36267471710.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 253872301921 in words is "two hundred fifty-three billion, eight hundred seventy-two million, three hundred one thousand, nine hundred twenty-one".