3206921 has 2 divisors, whose sum is σ = 3206922. Its totient is φ = 3206920.

The previous prime is 3206911. The next prime is 3206933. The reversal of 3206921 is 1296023.

3206921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3200521 + 6400 = 1789^2 + 80^2 .

It is an emirp because it is prime and its reverse (1296023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3206921 - 2¹⁰ = 3205897 is a prime.

It is a Chen prime.

It is equal to p₂₃₀₆₈₄ and since 3206921 and 230684 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (3206911) 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, 1603460 + 1603461.

It is an arithmetic number, because the mean of its divisors is an integer number (1603461).

Almost surely, 2^3206921 is an apocalyptic number.

It is an amenable number.

3206921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3206921 is an equidigital number, since it uses as much as digits as its factorization.

3206921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 3206921 is about 1790.7878154600. The cubic root of 3206921 is about 147.4674217047.

The spelling of 3206921 in words is "three million, two hundred six thousand, nine hundred twenty-one".