33440213 has 2 divisors, whose sum is σ = 33440214. Its totient is φ = 33440212.

The previous prime is 33440189. The next prime is 33440221. The reversal of 33440213 is 31204433.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27646564 + 5793649 = 5258^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 33440213 - 2⁶ = 33440149 is a prime.

It is a super-3 number, since 3×33440213³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is equal to p_2057132 and since 33440213 and 2057132 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 (33440233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16720106 + 16720107.

It is an arithmetic number, because the mean of its divisors is an integer number (16720107).

Almost surely, 2^33440213 is an apocalyptic number.

It is an amenable number.

33440213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33440213 is an equidigital number, since it uses as much as digits as its factorization.

33440213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 33440213 is about 5782.7513347887. The cubic root of 33440213 is about 322.1733984994.

Adding to 33440213 its reverse (31204433), we get a palindrome (64644646).

The spelling of 33440213 in words is "thirty-three million, four hundred forty thousand, two hundred thirteen".