253421504403 has 4 divisors (see below), whose sum is σ = 337895339208. Its totient is φ = 168947669600.

The previous prime is 253421504393. The next prime is 253421504477. The reversal of 253421504403 is 304405124352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 253421504403 - 2²¹ = 253419407251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253421504603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42236917398 + ... + 42236917403.

It is an arithmetic number, because the mean of its divisors is an integer number (84473834802).

Almost surely, 2^253421504403 is an apocalyptic number.

253421504403 is a deficient number, since it is larger than the sum of its proper divisors (84473834805).

253421504403 is an equidigital number, since it uses as much as digits as its factorization.

253421504403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84473834804.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 253421504403 its reverse (304405124352), we get a palindrome (557826628755).

The spelling of 253421504403 in words is "two hundred fifty-three billion, four hundred twenty-one million, five hundred four thousand, four hundred three".