304013221 has 2 divisors, whose sum is σ = 304013222. Its totient is φ = 304013220.

The previous prime is 304013219. The next prime is 304013257. The reversal of 304013221 is 122310403.

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., 266668900 + 37344321 = 16330^2 + 6111^2 .

It is a cyclic number.

It is not a de Polignac number, because 304013221 - 2¹ = 304013219 is a prime.

Together with 304013219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 304013195 and 304013204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304013291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152006610 + 152006611.

It is an arithmetic number, because the mean of its divisors is an integer number (152006611).

Almost surely, 2^304013221 is an apocalyptic number.

It is an amenable number.

304013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

304013221 is an equidigital number, since it uses as much as digits as its factorization.

304013221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 304013221 is about 17435.9749082178. The cubic root of 304013221 is about 672.4048287353.

Adding to 304013221 its reverse (122310403), we get a palindrome (426323624).

It can be divided in two parts, 3040 and 13221, that added together give a palindrome (16261).

The spelling of 304013221 in words is "three hundred four million, thirteen thousand, two hundred twenty-one".