204123040403 has 4 divisors (see below), whose sum is σ = 204125470560. Its totient is φ = 204120610248.

The previous prime is 204123040397. The next prime is 204123040477. The reversal of 204123040403 is 304040321402.

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

It is a cyclic number.

It is not a de Polignac number, because 204123040403 - 2²⁶ = 204055931539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204123040493) 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, 1084400 + ... + 1258637.

It is an arithmetic number, because the mean of its divisors is an integer number (51031367640).

Almost surely, 2^204123040403 is an apocalyptic number.

204123040403 is a deficient number, since it is larger than the sum of its proper divisors (2430157).

204123040403 is an equidigital number, since it uses as much as digits as its factorization.

204123040403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430156.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 204123040403 its reverse (304040321402), we get a palindrome (508163361805).

The spelling of 204123040403 in words is "two hundred four billion, one hundred twenty-three million, forty thousand, four hundred three".