304212321 has 16 divisors (see below), whose sum is σ = 515068800. Its totient is φ = 173835504.

The previous prime is 304212289. The next prime is 304212323. The reversal of 304212321 is 123212403.

It is not a de Polignac number, because 304212321 - 2⁵ = 304212289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 304212294 and 304212303.

It is not an unprimeable number, because it can be changed into a prime (304212323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804606 + ... + 804983.

It is an arithmetic number, because the mean of its divisors is an integer number (32191800).

Almost surely, 2^304212321 is an apocalyptic number.

It is an amenable number.

304212321 is a deficient number, since it is larger than the sum of its proper divisors (210856479).

304212321 is a wasteful number, since it uses less digits than its factorization.

304212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609605 (or 1609599 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 304212321 is about 17441.6834336597. The cubic root of 304212321 is about 672.5515839611.

Adding to 304212321 its reverse (123212403), we get a palindrome (427424724).

The spelling of 304212321 in words is "three hundred four million, two hundred twelve thousand, three hundred twenty-one".