12821717 has 2 divisors, whose sum is σ = 12821718. Its totient is φ = 12821716.

The previous prime is 12821701. The next prime is 12821729. The reversal of 12821717 is 71712821.

12821717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 155236 = 3559^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 12821717 - 2⁴ = 12821701 is a prime.

It is a super-3 number, since 3×12821717³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12821717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12821747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410858 + 6410859.

It is an arithmetic number, because the mean of its divisors is an integer number (6410859).

Almost surely, 2^12821717 is an apocalyptic number.

It is an amenable number.

12821717 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821717 is an equidigital number, since it uses as much as digits as its factorization.

12821717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 29.

The square root of 12821717 is about 3580.7425207630. The cubic root of 12821717 is about 234.0536378368.

The spelling of 12821717 in words is "twelve million, eight hundred twenty-one thousand, seven hundred seventeen".