243121245143 has 4 divisors (see below), whose sum is σ = 277852851600. Its totient is φ = 208389638688.

The previous prime is 243121245109. The next prime is 243121245181. The reversal of 243121245143 is 341542121342.

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

It is a de Polignac number, because none of the positive numbers 2^k-243121245143 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 (243121245743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17365803218 + ... + 17365803231.

It is an arithmetic number, because the mean of its divisors is an integer number (69463212900).

Almost surely, 2^243121245143 is an apocalyptic number.

243121245143 is a deficient number, since it is larger than the sum of its proper divisors (34731606457).

243121245143 is an equidigital number, since it uses as much as digits as its factorization.

243121245143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34731606456.

The product of its digits is 23040, while the sum is 32.

Adding to 243121245143 its reverse (341542121342), we get a palindrome (584663366485).

The spelling of 243121245143 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, one hundred forty-three".