3318221 has 2 divisors, whose sum is σ = 3318222. Its totient is φ = 3318220.

The previous prime is 3318193. The next prime is 3318223. The reversal of 3318221 is 1228133.

3318221 is digitally balanced in base 2, 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., 2941225 + 376996 = 1715^2 + 614^2 .

It is an emirp because it is prime and its reverse (1228133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3318221 - 2⁶ = 3318157 is a prime.

It is a super-2 number, since 2×3318221² = 22021181209682, which contains 22 as substring.

Together with 3318223, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3318193 and 3318202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3318223) 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, 1659110 + 1659111.

It is an arithmetic number, because the mean of its divisors is an integer number (1659111).

Almost surely, 2^3318221 is an apocalyptic number.

It is an amenable number.

3318221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3318221 is an equidigital number, since it uses as much as digits as its factorization.

3318221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 3318221 is about 1821.5984738685. The cubic root of 3318221 is about 149.1540679239.

The spelling of 3318221 in words is "three million, three hundred eighteen thousand, two hundred twenty-one".