243421055121 has 4 divisors (see below), whose sum is σ = 324561406832. Its totient is φ = 162280703412.

The previous prime is 243421055117. The next prime is 243421055191. The reversal of 243421055121 is 121550124342.

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 243421055121 - 2² = 243421055117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243421055191) 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, 40570175851 + ... + 40570175856.

It is an arithmetic number, because the mean of its divisors is an integer number (81140351708).

Almost surely, 2^243421055121 is an apocalyptic number.

It is an amenable number.

243421055121 is a deficient number, since it is larger than the sum of its proper divisors (81140351711).

243421055121 is an equidigital number, since it uses as much as digits as its factorization.

243421055121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81140351710.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 243421055121 its reverse (121550124342), we get a palindrome (364971179463).

The spelling of 243421055121 in words is "two hundred forty-three billion, four hundred twenty-one million, fifty-five thousand, one hundred twenty-one".