204234221 has 6 divisors (see below), whose sum is σ = 206286666. Its totient is φ = 202202000.

The previous prime is 204234193. The next prime is 204234299. The reversal of 204234221 is 122432402.

It can be written as a sum of positive squares in 3 ways, for example, as 82992100 + 121242121 = 9110^2 + 11011^2 .

It is not a de Polignac number, because 204234221 - 2¹⁸ = 203972077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204234193 and 204234202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204234421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191 + ... + 20211.

It is an arithmetic number, because the mean of its divisors is an integer number (34381111).

Almost surely, 2^204234221 is an apocalyptic number.

It is an amenable number.

204234221 is a deficient number, since it is larger than the sum of its proper divisors (2052445).

204234221 is an equidigital number, since it uses as much as digits as its factorization.

204234221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20223 (or 20122 counting only the distinct ones).

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

The square root of 204234221 is about 14291.0538799628. The cubic root of 204234221 is about 588.9017403007.

Adding to 204234221 its reverse (122432402), we get a palindrome (326666623).

It can be divided in two parts, 2042 and 34221, that added together give a palindrome (36263).

The spelling of 204234221 in words is "two hundred four million, two hundred thirty-four thousand, two hundred twenty-one".