65333221 has 2 divisors, whose sum is σ = 65333222. Its totient is φ = 65333220.

The previous prime is 65333207. The next prime is 65333263. The reversal of 65333221 is 12233356.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44957025 + 20376196 = 6705^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 65333221 - 2⁵ = 65333189 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65333291) 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, 32666610 + 32666611.

It is an arithmetic number, because the mean of its divisors is an integer number (32666611).

Almost surely, 2^65333221 is an apocalyptic number.

It is an amenable number.

65333221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65333221 is an equidigital number, since it uses as much as digits as its factorization.

65333221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 25.

The square root of 65333221 is about 8082.8968198289. The cubic root of 65333221 is about 402.7584770324.

Adding to 65333221 its reverse (12233356), we get a palindrome (77566577).

The spelling of 65333221 in words is "sixty-five million, three hundred thirty-three thousand, two hundred twenty-one".