12960721 has 4 divisors (see below), whose sum is σ = 12993444. Its totient is φ = 12928000.

The previous prime is 12960719. The next prime is 12960743. The reversal of 12960721 is 12706921.

It is a happy number.

12960721 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12706921 = 3517 ⋅3613.

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 3101121 = 3140^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 12960721 - 2¹ = 12960719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12960721.

It is not an unprimeable number, because it can be changed into a prime (12960751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15760 + ... + 16561.

It is an arithmetic number, because the mean of its divisors is an integer number (3248361).

Almost surely, 2^12960721 is an apocalyptic number.

It is an amenable number.

12960721 is a deficient number, since it is larger than the sum of its proper divisors (32723).

12960721 is an equidigital number, since it uses as much as digits as its factorization.

12960721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32722.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 12960721 is about 3600.1001374962. The cubic root of 12960721 is about 234.8964142838.

The spelling of 12960721 in words is "twelve million, nine hundred sixty thousand, seven hundred twenty-one".