33404213 has 2 divisors, whose sum is σ = 33404214. Its totient is φ = 33404212.

The previous prime is 33404197. The next prime is 33404221. The reversal of 33404213 is 31240433.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33258289 + 145924 = 5767^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 33404213 - 2⁴ = 33404197 is a prime.

It is a super-2 number, since 2×33404213² = 2231682892298738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33404233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16702106 + 16702107.

It is an arithmetic number, because the mean of its divisors is an integer number (16702107).

Almost surely, 2^33404213 is an apocalyptic number.

It is an amenable number.

33404213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33404213 is an equidigital number, since it uses as much as digits as its factorization.

33404213 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 33404213 is about 5779.6377914191. The cubic root of 33404213 is about 322.0577452602.

Adding to 33404213 its reverse (31240433), we get a palindrome (64644646).

The spelling of 33404213 in words is "thirty-three million, four hundred four thousand, two hundred thirteen".