231084221 has 2 divisors, whose sum is σ = 231084222. Its totient is φ = 231084220.

The previous prime is 231084211. The next prime is 231084229. The reversal of 231084221 is 122480132.

It is a happy number.

231084221 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., 215678596 + 15405625 = 14686^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 231084221 - 2⁶ = 231084157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231084229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115542110 + 115542111.

It is an arithmetic number, because the mean of its divisors is an integer number (115542111).

Almost surely, 2^231084221 is an apocalyptic number.

It is an amenable number.

231084221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231084221 is an equidigital number, since it uses as much as digits as its factorization.

231084221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 231084221 is about 15201.4545685602. The cubic root of 231084221 is about 613.6538038197.

The spelling of 231084221 in words is "two hundred thirty-one million, eighty-four thousand, two hundred twenty-one".