12080821 has 2 divisors, whose sum is σ = 12080822. Its totient is φ = 12080820.

The previous prime is 12080813. The next prime is 12080851. The reversal of 12080821 is 12808021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 2402500 = 3111^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 12080821 - 2³ = 12080813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12080792 and 12080801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12080851) 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, 6040410 + 6040411.

It is an arithmetic number, because the mean of its divisors is an integer number (6040411).

Almost surely, 2^12080821 is an apocalyptic number.

It is an amenable number.

12080821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12080821 is an equidigital number, since it uses as much as digits as its factorization.

12080821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 12080821 is about 3475.7475454929. The cubic root of 12080821 is about 229.4556819572.

Adding to 12080821 its reverse (12808021), we get a palindrome (24888842).

The spelling of 12080821 in words is "twelve million, eighty thousand, eight hundred twenty-one".