12976721 has 2 divisors, whose sum is σ = 12976722. Its totient is φ = 12976720.

The previous prime is 12976703. The next prime is 12976723. The reversal of 12976721 is 12767921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8202496 + 4774225 = 2864^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 12976721 - 2⁶ = 12976657 is a prime.

Together with 12976723, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₈₄₇₈₂₆ and since 12976721 and 847826 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12976723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6488360 + 6488361.

It is an arithmetic number, because the mean of its divisors is an integer number (6488361).

Almost surely, 2^12976721 is an apocalyptic number.

It is an amenable number.

12976721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12976721 is an equidigital number, since it uses as much as digits as its factorization.

12976721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 12976721 is about 3602.3216125160. The cubic root of 12976721 is about 234.9930343491.

The spelling of 12976721 in words is "twelve million, nine hundred seventy-six thousand, seven hundred twenty-one".