12876821 has 4 divisors (see below), whose sum is σ = 12969600. Its totient is φ = 12784044.

The previous prime is 12876791. The next prime is 12876833. The reversal of 12876821 is 12867821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12876821 - 2¹⁸ = 12614677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12816821) 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 in 3 ways as a sum of consecutive naturals, for example, 46181 + ... + 46458.

It is an arithmetic number, because the mean of its divisors is an integer number (3242400).

Almost surely, 2^12876821 is an apocalyptic number.

It is an amenable number.

12876821 is a deficient number, since it is larger than the sum of its proper divisors (92779).

12876821 is an equidigital number, since it uses as much as digits as its factorization.

12876821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92778.

The product of its digits is 10752, while the sum is 35.

The square root of 12876821 is about 3588.4287647939. The cubic root of 12876821 is about 234.3884567325.

The spelling of 12876821 in words is "twelve million, eight hundred seventy-six thousand, eight hundred twenty-one".