12821477 has 2 divisors, whose sum is σ = 12821478. Its totient is φ = 12821476.

The previous prime is 12821461. The next prime is 12821491. The reversal of 12821477 is 77412821.

It is a happy number.

12821477 is digitally balanced in base 3, 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., 11383876 + 1437601 = 3374^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 12821477 - 2⁴ = 12821461 is a prime.

It is equal to p₈₃₈₃₉₁ and since 12821477 and 838391 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12821437) 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, 6410738 + 6410739.

It is an arithmetic number, because the mean of its divisors is an integer number (6410739).

Almost surely, 2^12821477 is an apocalyptic number.

It is an amenable number.

12821477 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821477 is an equidigital number, since it uses as much as digits as its factorization.

12821477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 32.

The square root of 12821477 is about 3580.7090080039. The cubic root of 12821477 is about 234.0521774702.

The spelling of 12821477 in words is "twelve million, eight hundred twenty-one thousand, four hundred seventy-seven".