225086221 has 2 divisors, whose sum is σ = 225086222. Its totient is φ = 225086220.

The previous prime is 225086219. The next prime is 225086227. The reversal of 225086221 is 122680522.

225086221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224850025 + 236196 = 14995^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 225086221 - 2¹ = 225086219 is a prime.

Together with 225086219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225086221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225086227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112543110 + 112543111.

It is an arithmetic number, because the mean of its divisors is an integer number (112543111).

Almost surely, 2^225086221 is an apocalyptic number.

It is an amenable number.

225086221 is a deficient number, since it is larger than the sum of its proper divisors (1).

225086221 is an equidigital number, since it uses as much as digits as its factorization.

225086221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 225086221 is about 15002.8737580505. The cubic root of 225086221 is about 608.2978805302.

The spelling of 225086221 in words is "two hundred twenty-five million, eighty-six thousand, two hundred twenty-one".