12712321 has 2 divisors, whose sum is σ = 12712322. Its totient is φ = 12712320.

The previous prime is 12712313. The next prime is 12712351. The reversal of 12712321 is 12321721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9859600 + 2852721 = 3140^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 12712321 - 2³ = 12712313 is a prime.

It is not a weakly prime, because it can be changed into another prime (12712351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6356160 + 6356161.

It is an arithmetic number, because the mean of its divisors is an integer number (6356161).

Almost surely, 2^12712321 is an apocalyptic number.

It is an amenable number.

12712321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12712321 is an equidigital number, since it uses as much as digits as its factorization.

12712321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 19.

The square root of 12712321 is about 3565.4341951577. The cubic root of 12712321 is about 233.3860803654.

The spelling of 12712321 in words is "twelve million, seven hundred twelve thousand, three hundred twenty-one".