304430221 has 4 divisors (see below), whose sum is σ = 308600572. Its totient is φ = 300259872.

The previous prime is 304430219. The next prime is 304430227. The reversal of 304430221 is 122034403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122034403 = 67 ⋅1821409.

It can be written as a sum of positive squares in 2 ways, for example, as 120692196 + 183738025 = 10986^2 + 13555^2 .

It is a cyclic number.

It is not a de Polignac number, because 304430221 - 2¹ = 304430219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304430227) 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 in 3 ways as a sum of consecutive naturals, for example, 2085066 + ... + 2085211.

It is an arithmetic number, because the mean of its divisors is an integer number (77150143).

Almost surely, 2^304430221 is an apocalyptic number.

It is an amenable number.

304430221 is a deficient number, since it is larger than the sum of its proper divisors (4170351).

304430221 is an equidigital number, since it uses as much as digits as its factorization.

304430221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170350.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 304430221 is about 17447.9288455679. The cubic root of 304430221 is about 672.7121231680.

Adding to 304430221 its reverse (122034403), we get a palindrome (426464624).

The spelling of 304430221 in words is "three hundred four million, four hundred thirty thousand, two hundred twenty-one".