It is a tau number, because it is divible by the number of its divisors (36).
It is an Ulam number.
It is a plaindrome in base 10.
It is a congruent number.
It is an unprimeable number.
222356 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 22356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30576).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22356 is a wasteful number, since it uses less digits than its factorization.
22356 is an evil number, because the sum of its binary digits is even.
The square root of 22356 is about 149.5192295325. The cubic root of 22356 is about 28.1707256190.
Adding to 22356 its reverse (65322), we get a palindrome (87678).
The spelling of 22356 in words is "twenty-two thousand, three hundred fifty-six".