12672721 has 2 divisors, whose sum is σ = 12672722. Its totient is φ = 12672720.

The previous prime is 12672713. The next prime is 12672733. The reversal of 12672721 is 12727621.

12672721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 4326400 = 2889^2 + 2080^2 .

It is an emirp because it is prime and its reverse (12727621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12672721 - 2³ = 12672713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12672721.

It is not a weakly prime, because it can be changed into another prime (12676721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6336360 + 6336361.

It is an arithmetic number, because the mean of its divisors is an integer number (6336361).

Almost surely, 2^12672721 is an apocalyptic number.

It is an amenable number.

12672721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12672721 is an equidigital number, since it uses as much as digits as its factorization.

12672721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 28.

The square root of 12672721 is about 3559.8765428031. The cubic root of 12672721 is about 233.1434888915.

The spelling of 12672721 in words is "twelve million, six hundred seventy-two thousand, seven hundred twenty-one".