12727721 has 2 divisors, whose sum is σ = 12727722. Its totient is φ = 12727720.

The previous prime is 12727709. The next prime is 12727727. The reversal of 12727721 is 12772721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 18496 = 3565^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 12727721 - 2¹⁰ = 12726697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12727727) 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, 6363860 + 6363861.

It is an arithmetic number, because the mean of its divisors is an integer number (6363861).

Almost surely, 2^12727721 is an apocalyptic number.

It is an amenable number.

12727721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12727721 is an equidigital number, since it uses as much as digits as its factorization.

12727721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2744, while the sum is 29.

The square root of 12727721 is about 3567.5931662677. The cubic root of 12727721 is about 233.4802854354.

The spelling of 12727721 in words is "twelve million, seven hundred twenty-seven thousand, seven hundred twenty-one".