12927721 has 2 divisors, whose sum is σ = 12927722. Its totient is φ = 12927720.

The previous prime is 12927703. The next prime is 12927743. The reversal of 12927721 is 12772921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 225625 = 3564^2 + 475^2 .

It is a cyclic number.

It is not a de Polignac number, because 12927721 - 2¹⁷ = 12796649 is a prime.

It is not a weakly prime, because it can be changed into another prime (12927781) 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, 6463860 + 6463861.

It is an arithmetic number, because the mean of its divisors is an integer number (6463861).

Almost surely, 2^12927721 is an apocalyptic number.

It is an amenable number.

12927721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12927721 is an equidigital number, since it uses as much as digits as its factorization.

12927721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 12927721 is about 3595.5140105415. The cubic root of 12927721 is about 234.6968839772.

The spelling of 12927721 in words is "twelve million, nine hundred twenty-seven thousand, seven hundred twenty-one".