304212121 has 2 divisors, whose sum is σ = 304212122. Its totient is φ = 304212120.

The previous prime is 304212109. The next prime is 304212137. The reversal of 304212121 is 121212403.

It is an a-pointer prime, because the next prime (304212137) can be obtained adding 304212121 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304014096 + 198025 = 17436^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 304212121 - 2⁵ = 304212089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 304212095 and 304212104.

It is not a weakly prime, because it can be changed into another prime (304212151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152106060 + 152106061.

It is an arithmetic number, because the mean of its divisors is an integer number (152106061).

Almost surely, 2^304212121 is an apocalyptic number.

It is an amenable number.

304212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

304212121 is an equidigital number, since it uses as much as digits as its factorization.

304212121 is an evil number, because the sum of its binary digits is even.

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

The square root of 304212121 is about 17441.6777002673. The cubic root of 304212121 is about 672.5514365747.

Adding to 304212121 its reverse (121212403), we get a palindrome (425424524).

The spelling of 304212121 in words is "three hundred four million, two hundred twelve thousand, one hundred twenty-one".