233505221 has 2 divisors, whose sum is σ = 233505222. Its totient is φ = 233505220.

The previous prime is 233505191. The next prime is 233505229. The reversal of 233505221 is 122505332.

233505221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213568996 + 19936225 = 14614^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 233505221 - 2⁶ = 233505157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233505229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116752610 + 116752611.

It is an arithmetic number, because the mean of its divisors is an integer number (116752611).

Almost surely, 2^233505221 is an apocalyptic number.

It is an amenable number.

233505221 is a deficient number, since it is larger than the sum of its proper divisors (1).

233505221 is an equidigital number, since it uses as much as digits as its factorization.

233505221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 233505221 is about 15280.8776253198. The cubic root of 233505221 is about 615.7893853611.

The spelling of 233505221 in words is "two hundred thirty-three million, five hundred five thousand, two hundred twenty-one".