12970721 has 2 divisors, whose sum is σ = 12970722. Its totient is φ = 12970720.

The previous prime is 12970709. The next prime is 12970733. The reversal of 12970721 is 12707921.

It is a balanced prime because it is at equal distance from previous prime (12970709) and next prime (12970733).

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 190096 = 3575^2 + 436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12970721 is a prime.

It is not a weakly prime, because it can be changed into another prime (12970751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6485360 + 6485361.

It is an arithmetic number, because the mean of its divisors is an integer number (6485361).

Almost surely, 2^12970721 is an apocalyptic number.

It is an amenable number.

12970721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12970721 is an equidigital number, since it uses as much as digits as its factorization.

12970721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 12970721 is about 3601.4887199601. The cubic root of 12970721 is about 234.9568111366.

The spelling of 12970721 in words is "twelve million, nine hundred seventy thousand, seven hundred twenty-one".