33305221 has 2 divisors, whose sum is σ = 33305222. Its totient is φ = 33305220.

The previous prime is 33305179. The next prime is 33305257. The reversal of 33305221 is 12250333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33292900 + 12321 = 5770^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 33305221 - 2⁹ = 33304709 is a prime.

It is a super-2 number, since 2×33305221² = 2218475491717682, which contains 22 as substring.

It is equal to p_2049310 and since 33305221 and 2049310 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 (33305621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16652610 + 16652611.

It is an arithmetic number, because the mean of its divisors is an integer number (16652611).

Almost surely, 2^33305221 is an apocalyptic number.

It is an amenable number.

33305221 is a deficient number, since it is larger than the sum of its proper divisors (1).

33305221 is an equidigital number, since it uses as much as digits as its factorization.

33305221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 33305221 is about 5771.0675788800. The cubic root of 33305221 is about 321.7392955576.

Adding to 33305221 its reverse (12250333), we get a palindrome (45555554).

The spelling of 33305221 in words is "thirty-three million, three hundred five thousand, two hundred twenty-one".