243121404203 has 4 divisors (see below), whose sum is σ = 244394291328. Its totient is φ = 241848517080.

The previous prime is 243121404179. The next prime is 243121404209. The reversal of 243121404203 is 302404121342.

243121404203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121404203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243121404209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636443276 + ... + 636443657.

It is an arithmetic number, because the mean of its divisors is an integer number (61098572832).

Almost surely, 2^243121404203 is an apocalyptic number.

243121404203 is a deficient number, since it is larger than the sum of its proper divisors (1272887125).

243121404203 is a wasteful number, since it uses less digits than its factorization.

243121404203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272887124.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 243121404203 its reverse (302404121342), we get a palindrome (545525525545).

The spelling of 243121404203 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred four thousand, two hundred three".