204234421 has 2 divisors, whose sum is σ = 204234422. Its totient is φ = 204234420.

The previous prime is 204234389. The next prime is 204234467. The reversal of 204234421 is 124432402.

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., 134328100 + 69906321 = 11590^2 + 8361^2 .

It is a cyclic number.

It is not a de Polignac number, because 204234421 - 2⁵ = 204234389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204234392 and 204234401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204234521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102117210 + 102117211.

It is an arithmetic number, because the mean of its divisors is an integer number (102117211).

Almost surely, 2^204234421 is an apocalyptic number.

It is an amenable number.

204234421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204234421 is an equidigital number, since it uses as much as digits as its factorization.

204234421 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 204234421 is about 14291.0608773457. The cubic root of 204234421 is about 588.9019325315.

Adding to 204234421 its reverse (124432402), we get a palindrome (328666823).

It can be divided in two parts, 2042 and 34421, that added together give a palindrome (36463).

The spelling of 204234421 in words is "two hundred four million, two hundred thirty-four thousand, four hundred twenty-one".