22216 has 8 divisors (see below), whose sum is σ = 41670.
Its totient is φ = 11104.
The previous prime is 22193. The next prime is 22229. The reversal of 22216 is 61222.
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 21316 + 900 = 146^2 + 30^2
It is a tau number, because it is divible by the number of its divisors (8).
It is a nialpdrome in base 8.
It is a junction number, because it is equal to n+sod(n) for n = 22196 and 22205.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1381 + ... + 1396.
222216 is an apocalyptic number.
It is an amenable number.
22216 is a deficient number, since it is larger than the sum of its proper divisors (19454).
22216 is a wasteful number, since it uses less digits than its factorization.
22216 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2783 (or 2779 counting only the distinct ones).
The product of its digits is 48, while the sum is 13.
The square root of 22216 is about 149.0503270711.
The cubic root of 22216 is about 28.1117979190.
Note that the first 3 decimals are identical.
Adding to 22216 its reverse (61222), we get a palindrome (83438).
The spelling of 22216 in words is "twenty-two thousand, two hundred sixteen".