204244421 has 2 divisors, whose sum is σ = 204244422. Its totient is φ = 204244420.

The previous prime is 204244363. The next prime is 204244429. The reversal of 204244421 is 124442402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188925025 + 15319396 = 13745^2 + 3914^2 .

It is a cyclic number.

It is not a de Polignac number, because 204244421 - 2¹⁸ = 203982277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204244429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102122210 + 102122211.

It is an arithmetic number, because the mean of its divisors is an integer number (102122211).

Almost surely, 2^204244421 is an apocalyptic number.

It is an amenable number.

204244421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204244421 is an equidigital number, since it uses as much as digits as its factorization.

204244421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 204244421 is about 14291.4107421206. The cubic root of 204244421 is about 588.9115439104.

Adding to 204244421 its reverse (124442402), we get a palindrome (328686823).

The spelling of 204244421 in words is "two hundred four million, two hundred forty-four thousand, four hundred twenty-one".