243123345121 has 4 divisors (see below), whose sum is σ = 243203772672. Its totient is φ = 243042917572.

The previous prime is 243123345061. The next prime is 243123345173. The reversal of 243123345121 is 121543321342.

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 243123345121 - 2⁷ = 243123344993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243123325121) 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, 40209241 + ... + 40215286.

It is an arithmetic number, because the mean of its divisors is an integer number (60800943168).

Almost surely, 2^243123345121 is an apocalyptic number.

It is an amenable number.

243123345121 is a deficient number, since it is larger than the sum of its proper divisors (80427551).

243123345121 is an equidigital number, since it uses as much as digits as its factorization.

243123345121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80427550.

The product of its digits is 17280, while the sum is 31.

Adding to 243123345121 its reverse (121543321342), we get a palindrome (364666666463).

The spelling of 243123345121 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred forty-five thousand, one hundred twenty-one".