12942821 has 2 divisors, whose sum is σ = 12942822. Its totient is φ = 12942820.

The previous prime is 12942799. The next prime is 12942829. The reversal of 12942821 is 12824921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 5712100 = 2689^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12942821 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 (12942829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6471410 + 6471411.

It is an arithmetic number, because the mean of its divisors is an integer number (6471411).

Almost surely, 2^12942821 is an apocalyptic number.

It is an amenable number.

12942821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12942821 is an equidigital number, since it uses as much as digits as its factorization.

12942821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 12942821 is about 3597.6132365778. The cubic root of 12942821 is about 234.7882262960.

The spelling of 12942821 in words is "twelve million, nine hundred forty-two thousand, eight hundred twenty-one".