12821663 has 2 divisors, whose sum is σ = 12821664. Its totient is φ = 12821662.

The previous prime is 12821659. The next prime is 12821671. The reversal of 12821663 is 36612821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12821663 - 2² = 12821659 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12821623) 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, 6410831 + 6410832.

It is an arithmetic number, because the mean of its divisors is an integer number (6410832).

Almost surely, 2^12821663 is an apocalyptic number.

12821663 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821663 is an equidigital number, since it uses as much as digits as its factorization.

12821663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 12821663 is about 3580.7349804195. The cubic root of 12821663 is about 234.0533092559.

The spelling of 12821663 in words is "twelve million, eight hundred twenty-one thousand, six hundred sixty-three".