33866221 has 2 divisors, whose sum is σ = 33866222. Its totient is φ = 33866220.

The previous prime is 33866149. The next prime is 33866237. The reversal of 33866221 is 12266833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24950025 + 8916196 = 4995^2 + 2986^2 .

It is an emirp because it is prime and its reverse (12266833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33866221 - 2¹⁵ = 33833453 is a prime.

It is a super-2 number, since 2×33866221² = 2293841849641682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33866321) 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, 16933110 + 16933111.

It is an arithmetic number, because the mean of its divisors is an integer number (16933111).

Almost surely, 2^33866221 is an apocalyptic number.

It is an amenable number.

33866221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33866221 is an equidigital number, since it uses as much as digits as its factorization.

33866221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 33866221 is about 5819.4691338644. The cubic root of 33866221 is about 323.5357274884.

The spelling of 33866221 in words is "thirty-three million, eight hundred sixty-six thousand, two hundred twenty-one".