233666221 has 2 divisors, whose sum is σ = 233666222. Its totient is φ = 233666220.

The previous prime is 233666203. The next prime is 233666239. The reversal of 233666221 is 122666332.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (233666203) and next prime (233666239).

It can be written as a sum of positive squares in only one way, i.e., 159516900 + 74149321 = 12630^2 + 8611^2 .

It is a cyclic number.

It is not a de Polignac number, because 233666221 - 2⁹ = 233665709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233666201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116833110 + 116833111.

It is an arithmetic number, because the mean of its divisors is an integer number (116833111).

Almost surely, 2^233666221 is an apocalyptic number.

It is an amenable number.

233666221 is a deficient number, since it is larger than the sum of its proper divisors (1).

233666221 is an equidigital number, since it uses as much as digits as its factorization.

233666221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 31.

The square root of 233666221 is about 15286.1447396000. The cubic root of 233666221 is about 615.9308801472.

The spelling of 233666221 in words is "two hundred thirty-three million, six hundred sixty-six thousand, two hundred twenty-one".