204440213 has 2 divisors, whose sum is σ = 204440214. Its totient is φ = 204440212.

The previous prime is 204440191. The next prime is 204440237. The reversal of 204440213 is 312044402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110292004 + 94148209 = 10502^2 + 9703^2 .

It is a cyclic number.

It is not a de Polignac number, because 204440213 - 2⁶ = 204440149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204440263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102220106 + 102220107.

It is an arithmetic number, because the mean of its divisors is an integer number (102220107).

Almost surely, 2^204440213 is an apocalyptic number.

It is an amenable number.

204440213 is a deficient number, since it is larger than the sum of its proper divisors (1).

204440213 is an equidigital number, since it uses as much as digits as its factorization.

204440213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 204440213 is about 14298.2590898333. The cubic root of 204440213 is about 589.0996638501.

Adding to 204440213 its reverse (312044402), we get a palindrome (516484615).

The spelling of 204440213 in words is "two hundred four million, four hundred forty thousand, two hundred thirteen".