204304421 has 2 divisors, whose sum is σ = 204304422. Its totient is φ = 204304420.

The previous prime is 204304403. The next prime is 204304427. The reversal of 204304421 is 124403402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190053796 + 14250625 = 13786^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 204304421 - 2⁶ = 204304357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 204304393 and 204304402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204304427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102152210 + 102152211.

It is an arithmetic number, because the mean of its divisors is an integer number (102152211).

Almost surely, 2^204304421 is an apocalyptic number.

It is an amenable number.

204304421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204304421 is an equidigital number, since it uses as much as digits as its factorization.

204304421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 204304421 is about 14293.5097509324. The cubic root of 204304421 is about 588.9692055967.

Adding to 204304421 its reverse (124403402), we get a palindrome (328707823).

The spelling of 204304421 in words is "two hundred four million, three hundred four thousand, four hundred twenty-one".