It is a happy number.
2221 is nontrivially palindromic in base 6.
2221 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 is a cyclic number.
It is a magnanimous number.
2221 is an undulating number in base 6.
2221 is a lucky number.
It is a plaindrome in base 16.
It is a nialpdrome in base 7 and base 10.
It is a congruent number.
It is an amenable number.
2221 is an equidigital number, since it uses as much as digits as its factorization.
2221 is an evil number, because the sum of its binary digits is even.
The square root of 2221 is about 47.1274866718. The cubic root of 2221 is about 13.0471659460.
Adding to 2221 its reverse (1222), we get a palindrome (3443).
Subtracting from 2221 its reverse (1222), we obtain a palindrome (999).
The spelling of 2221 in words is "two thousand, two hundred twenty-one", and thus it is an iban number.