9221 has 2 divisors, whose sum is σ = 9222.
Its totient is φ = 9220.
The previous prime is 9209. The next prime is 9227. The reversal of 9221 is 1229.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 9025 + 196 = 95^2 + 14^2
It is an emirp because it is prime and its reverse (1229) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 9221 - 26 = 9157 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a Curzon number.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 9196 and 9205.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 9221.
It is not a weakly prime, because it can be changed into another prime (9227) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4610 + 4611.
It is an arithmetic number, because the mean of its divisors is an integer number (4611).
29221 is an apocalyptic number.
It is an amenable number.
9221 is a deficient number, since it is larger than the sum of its proper divisors (1).
9221 is an equidigital number, since it uses as much as digits as its factorization.
9221 is an evil number, because the sum of its binary digits is even.
The product of its digits is 36, while the sum is 14.
The square root of 9221 is about 96.0260381355.
The cubic root of 9221 is about 20.9697220501.
The spelling of 9221 in words is "nine thousand, two hundred twenty-one".