Adding to 221144 its reverse (441122), we get a palindrome (662266).
It is a nude number because it is divisible by every one of its digits.
It is a plaindrome in base 15.
It is a zygodrome in base 10.
It is a congruent number.
It is an unprimeable number.
221144 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2221144 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 221144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221144 is a wasteful number, since it uses less digits than its factorization.
221144 is an evil number, because the sum of its binary digits is even.
The square root of 221144 is about 470.2595028280. The cubic root of 221144 is about 60.4725645703.
The spelling of 221144 in words is "two hundred twenty-one thousand, one hundred forty-four", and thus it is an iban number.