204003123123 has 4 divisors (see below), whose sum is σ = 272004164168. Its totient is φ = 136002082080.

The previous prime is 204003123097. The next prime is 204003123131. The reversal of 204003123123 is 321321300402.

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

It is not a de Polignac number, because 204003123123 - 2²⁹ = 203466252211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204003123123.

It is not an unprimeable number, because it can be changed into a prime (204003123133) 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, 34000520518 + ... + 34000520523.

It is an arithmetic number, because the mean of its divisors is an integer number (68001041042).

Almost surely, 2^204003123123 is an apocalyptic number.

204003123123 is a deficient number, since it is larger than the sum of its proper divisors (68001041045).

204003123123 is an equidigital number, since it uses as much as digits as its factorization.

204003123123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68001041044.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 204003123123 its reverse (321321300402), we get a palindrome (525324423525).

The spelling of 204003123123 in words is "two hundred four billion, three million, one hundred twenty-three thousand, one hundred twenty-three".