12287321 has 2 divisors, whose sum is σ = 12287322. Its totient is φ = 12287320.

The previous prime is 12287309. The next prime is 12287333. The reversal of 12287321 is 12378221.

It is a balanced prime because it is at equal distance from previous prime (12287309) and next prime (12287333).

It can be written as a sum of positive squares in only one way, i.e., 8620096 + 3667225 = 2936^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 12287321 - 2²² = 8093017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12287371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6143660 + 6143661.

It is an arithmetic number, because the mean of its divisors is an integer number (6143661).

Almost surely, 2^12287321 is an apocalyptic number.

It is an amenable number.

12287321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12287321 is an equidigital number, since it uses as much as digits as its factorization.

12287321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 12287321 is about 3505.3275167950. The cubic root of 12287321 is about 230.7556807913.

The spelling of 12287321 in words is "twelve million, two hundred eighty-seven thousand, three hundred twenty-one".