22218 has 24 divisors (see below), whose sum is σ = 53088. Its totient is φ = 6072.
The previous prime is 22193. The next prime is 22229. The reversal of 22218 is 81222.
It is a junction number, because it is equal to n+sod(n) for n = 22197 and 22206.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 22218.
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 955 + ... + 977.
It is an arithmetic number, because the mean of its divisors is an integer number (2212).
222218 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 22218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26544).
22218 is an abundant number, since it is smaller than the sum of its proper divisors (30870).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22218 is a wasteful number, since it uses less digits than its factorization.
22218 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 58 (or 35 counting only the distinct ones).
The product of its digits is 64, while the sum is 15.
The square root of 22218 is about 149.0570360634. The cubic root of 22218 is about 28.1126414839.
The spelling of 22218 in words is "twenty-two thousand, two hundred eighteen".
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