14256721 has 2 divisors, whose sum is σ = 14256722. Its totient is φ = 14256720.

The previous prime is 14256713. The next prime is 14256733. The reversal of 14256721 is 12765241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11155600 + 3101121 = 3340^2 + 1761^2 .

It is an emirp because it is prime and its reverse (12765241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 14256721 - 2³ = 14256713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 14256721.

It is not a weakly prime, because it can be changed into another prime (14250721) 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, 7128360 + 7128361.

It is an arithmetic number, because the mean of its divisors is an integer number (7128361).

Almost surely, 2^14256721 is an apocalyptic number.

It is an amenable number.

14256721 is a deficient number, since it is larger than the sum of its proper divisors (1).

14256721 is an equidigital number, since it uses as much as digits as its factorization.

14256721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 14256721 is about 3775.8073308896. The cubic root of 14256721 is about 242.4784888986.

The spelling of 14256721 in words is "fourteen million, two hundred fifty-six thousand, seven hundred twenty-one".