12799021 has 2 divisors, whose sum is σ = 12799022. Its totient is φ = 12799020.

The previous prime is 12799009. The next prime is 12799043. The reversal of 12799021 is 12099721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11464996 + 1334025 = 3386^2 + 1155^2 .

It is an emirp because it is prime and its reverse (12099721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12799021 - 2⁹ = 12798509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12799051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6399510 + 6399511.

It is an arithmetic number, because the mean of its divisors is an integer number (6399511).

Almost surely, 2^12799021 is an apocalyptic number.

It is an amenable number.

12799021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12799021 is an equidigital number, since it uses as much as digits as its factorization.

12799021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12799021 is about 3577.5719419741. The cubic root of 12799021 is about 233.9154551271.

The spelling of 12799021 in words is "twelve million, seven hundred ninety-nine thousand, twenty-one".