304343243221 has 2 divisors, whose sum is σ = 304343243222. Its totient is φ = 304343243220.

The previous prime is 304343243209. The next prime is 304343243297. The reversal of 304343243221 is 122342343403.

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., 279026932900 + 25316310321 = 528230^2 + 159111^2 .

It is a cyclic number.

It is not a de Polignac number, because 304343243221 - 2¹¹ = 304343241173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304343343221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152171621610 + 152171621611.

It is an arithmetic number, because the mean of its divisors is an integer number (152171621611).

Almost surely, 2^304343243221 is an apocalyptic number.

It is an amenable number.

304343243221 is a deficient number, since it is larger than the sum of its proper divisors (1).

304343243221 is an equidigital number, since it uses as much as digits as its factorization.

304343243221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 304343243221 its reverse (122342343403), we get a palindrome (426685586624).

The spelling of 304343243221 in words is "three hundred four billion, three hundred forty-three million, two hundred forty-three thousand, two hundred twenty-one".