204423421 has 2 divisors, whose sum is σ = 204423422. Its totient is φ = 204423420.

The previous prime is 204423403. The next prime is 204423449. The reversal of 204423421 is 124324402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157226521 + 47196900 = 12539^2 + 6870^2 .

It is a cyclic number.

It is not a de Polignac number, because 204423421 - 2⁵ = 204423389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204423392 and 204423401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204423221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102211710 + 102211711.

It is an arithmetic number, because the mean of its divisors is an integer number (102211711).

Almost surely, 2^204423421 is an apocalyptic number.

It is an amenable number.

204423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204423421 is an equidigital number, since it uses as much as digits as its factorization.

204423421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 204423421 is about 14297.6718734205. The cubic root of 204423421 is about 589.0835345504.

Adding to 204423421 its reverse (124324402), we get a palindrome (328747823).

The spelling of 204423421 in words is "two hundred four million, four hundred twenty-three thousand, four hundred twenty-one".