204004421 has 8 divisors (see below), whose sum is σ = 210441720. Its totient is φ = 197615808.

The previous prime is 204004379. The next prime is 204004429. The reversal of 204004421 is 124400402.

It can be written as a sum of positive squares in 4 ways, for example, as 170015521 + 33988900 = 13039^2 + 5830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204004421 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 204004421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204004429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3566 + ... + 20511.

It is an arithmetic number, because the mean of its divisors is an integer number (26305215).

Almost surely, 2^204004421 is an apocalyptic number.

It is an amenable number.

204004421 is a deficient number, since it is larger than the sum of its proper divisors (6437299).

204004421 is a wasteful number, since it uses less digits than its factorization.

204004421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24343.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 204004421 is about 14283.0116222035. The cubic root of 204004421 is about 588.6807841722.

Adding to 204004421 its reverse (124400402), we get a palindrome (328404823).

The spelling of 204004421 in words is "two hundred four million, four thousand, four hundred twenty-one".