304121221 has 4 divisors (see below), whose sum is σ = 304195500. Its totient is φ = 304046944.

The previous prime is 304121189. The next prime is 304121281. The reversal of 304121221 is 122121403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122121403 = 4483 ⋅27241.

It can be written as a sum of positive squares in 2 ways, for example, as 6558721 + 297562500 = 2561^2 + 17250^2 .

It is a cyclic number.

It is not a de Polignac number, because 304121221 - 2⁵ = 304121189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 304121195 and 304121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304121281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30616 + ... + 39313.

It is an arithmetic number, because the mean of its divisors is an integer number (76048875).

Almost surely, 2^304121221 is an apocalyptic number.

It is an amenable number.

304121221 is a deficient number, since it is larger than the sum of its proper divisors (74279).

304121221 is an equidigital number, since it uses as much as digits as its factorization.

304121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74278.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 304121221 is about 17439.0716782746. The cubic root of 304121221 is about 672.4844427333.

Adding to 304121221 its reverse (122121403), we get a palindrome (426242624).

The spelling of 304121221 in words is "three hundred four million, one hundred twenty-one thousand, two hundred twenty-one".