12808321 has 2 divisors, whose sum is σ = 12808322. Its totient is φ = 12808320.

The previous prime is 12808319. The next prime is 12808357. The reversal of 12808321 is 12380821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9217296 + 3591025 = 3036^2 + 1895^2 .

It is an emirp because it is prime and its reverse (12380821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12808321 - 2¹ = 12808319 is a prime.

Together with 12808319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12808381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6404160 + 6404161.

It is an arithmetic number, because the mean of its divisors is an integer number (6404161).

Almost surely, 2^12808321 is an apocalyptic number.

It is an amenable number.

12808321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12808321 is an equidigital number, since it uses as much as digits as its factorization.

12808321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 12808321 is about 3578.8714701705. The cubic root of 12808321 is about 233.9720971429.

The spelling of 12808321 in words is "twelve million, eight hundred eight thousand, three hundred twenty-one".