It is a happy number.
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 221076.
221076 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2221076 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 221076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221076 is a wasteful number, since it uses less digits than its factorization.
221076 is an odious number, because the sum of its binary digits is odd.
The square root of 221076 is about 470.1871967632. The cubic root of 221076 is about 60.4663656592.
Adding to 221076 its reverse (670122), we get a palindrome (891198).
The spelling of 221076 in words is "two hundred twenty-one thousand, seventy-six".