12721256 has 16 divisors (see below), whose sum is σ = 24675300. Its totient is φ = 6141184.

The previous prime is 12721217. The next prime is 12721271. The reversal of 12721256 is 65212721.

It can be written as a sum of positive squares in 2 ways, for example, as 12716356 + 4900 = 3566^2 + 70^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27185 + ... + 27648.

Almost surely, 2^12721256 is an apocalyptic number.

It is an amenable number.

12721256 is a deficient number, since it is larger than the sum of its proper divisors (11954044).

12721256 is a wasteful number, since it uses less digits than its factorization.

12721256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54868 (or 54864 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 12721256 is about 3566.6869781353. The cubic root of 12721256 is about 233.4407469171.

Adding to 12721256 its reverse (65212721), we get a palindrome (77933977).

The spelling of 12721256 in words is "twelve million, seven hundred twenty-one thousand, two hundred fifty-six".