22222 is nontrivially palindromic in base 10.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a nude number because it is divisible by every one of its digits.
22222 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10 and base 16.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a congruent number.
It is a Kaprekar number, because its square (493817284) can be partitioned into two parts whose sum is 22222.
222222 is an apocalyptic number.
22222 is a wasteful number, since it uses less digits than its factorization.
22222 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 314.
The square root of 22222 is about 149.0704531421. The cubic root of 22222 is about 28.1143284617.
The spelling of 22222 in words is "twenty-two thousand, two hundred twenty-two", and is thus an iban number.