10668821 has 2 divisors, whose sum is σ = 10668822. Its totient is φ = 10668820.

The previous prime is 10668797. The next prime is 10668851. The reversal of 10668821 is 12886601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7761796 + 2907025 = 2786^2 + 1705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10668821 is a prime.

It is a super-2 number, since 2×10668821² = 227647483060082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10668851) 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, 5334410 + 5334411.

It is an arithmetic number, because the mean of its divisors is an integer number (5334411).

Almost surely, 2^10668821 is an apocalyptic number.

It is an amenable number.

10668821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10668821 is an equidigital number, since it uses as much as digits as its factorization.

10668821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 10668821 is about 3266.3161206472. The cubic root of 10668821 is about 220.1433019536.

The spelling of 10668821 in words is "ten million, six hundred sixty-eight thousand, eight hundred twenty-one".