204020003121 has 16 divisors (see below), whose sum is σ = 296883679680. Its totient is φ = 123595440320.

The previous prime is 204020003071. The next prime is 204020003147. The reversal of 204020003121 is 121300020402.

It is not a de Polignac number, because 204020003121 - 2²⁷ = 203885785393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204020003121.

It is not an unprimeable number, because it can be changed into a prime (204020003021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1248006 + ... + 1401983.

It is an arithmetic number, because the mean of its divisors is an integer number (18555229980).

Almost surely, 2^204020003121 is an apocalyptic number.

It is an amenable number.

204020003121 is a deficient number, since it is larger than the sum of its proper divisors (92863676559).

204020003121 is a wasteful number, since it uses less digits than its factorization.

204020003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652336.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 204020003121 its reverse (121300020402), we get a palindrome (325320023523).

The spelling of 204020003121 in words is "two hundred four billion, twenty million, three thousand, one hundred twenty-one".