• 222 can be written using four 4's:
222 is nontrivially palindromic in base 10 and base 13.
222 is an esthetic number in base 6 and base 16, because in such bases its adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
222 is an admirable number.
It is a nude number because it is divisible by every one of its digits.
222 is an undulating number in base 6 and base 13.
222 is a nontrivial repdigit in base 10.
It is a plaindrome in base 8, base 9, base 10, base 12, base 14 and base 16.
It is a nialpdrome in base 10 and base 15.
It is a zygodrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 222.
It is a congruent number.
2222 is an apocalyptic number.
222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
222 is a wasteful number, since it uses less digits than its factorization.
222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 42.
The square root of 222 is about 14.8996644258. The cubic root of 222 is about 6.0550489465.