221644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an unprimeable number.
2221644 is an apocalyptic number.
It is an amenable number.
221644 is a wasteful number, since it uses less digits than its factorization.
221644 is an odious number, because the sum of its binary digits is odd.
The square root of 221644 is about 470.7908240397. The cubic root of 221644 is about 60.5181058211.
Adding to 221644 its reverse (446122), we get a palindrome (667766).
The spelling of 221644 in words is "two hundred twenty-one thousand, six hundred forty-four".