253421561243 has 4 divisors (see below), whose sum is σ = 253426667760. Its totient is φ = 253416454728.

The previous prime is 253421561231. The next prime is 253421561333. The reversal of 253421561243 is 342165124352.

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 253421561243 - 2²⁸ = 253153125787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253421561197 and 253421561206.

It is not an unprimeable number, because it can be changed into a prime (253421561213) 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, 2478080 + ... + 2578317.

It is an arithmetic number, because the mean of its divisors is an integer number (63356666940).

Almost surely, 2^253421561243 is an apocalyptic number.

253421561243 is a deficient number, since it is larger than the sum of its proper divisors (5106517).

253421561243 is an equidigital number, since it uses as much as digits as its factorization.

253421561243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106516.

The product of its digits is 172800, while the sum is 38.

Adding to 253421561243 its reverse (342165124352), we get a palindrome (595586685595).

The spelling of 253421561243 in words is "two hundred fifty-three billion, four hundred twenty-one million, five hundred sixty-one thousand, two hundred forty-three".