221244 has 24 divisors (see below), whose sum is σ = 524160.
Its totient is φ = 72624.
The previous prime is 221239. The next prime is 221251. The reversal of 221244 is 442122.
Adding to 221244 its reverse (442122), we get a palindrome (663366).
It can be divided in two parts, 221 and 244, that added together give a triangular number (465 = T30).
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1147 + ... + 1325.
It is an arithmetic number, because the mean of its divisors is an integer number (21840).
2221244 is an apocalyptic number.
It is an amenable number.
221244 is an abundant number, since it is smaller than the sum of its proper divisors (302916).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
221244 is a wasteful number, since it uses less digits than its factorization.
221244 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 289 (or 287 counting only the distinct ones).
The product of its digits is 128, while the sum is 15.
The square root of 221244 is about 470.3658150844.
The cubic root of 221244 is about 60.4816783079.
The spelling of 221244 in words is "two hundred twenty-one thousand, two hundred forty-four", and thus it is an iban number.