Do you remember your divisibility rule for 9...
if the sum of the digits is divisibile by 9 then so is the number...
ex...2223 2+2+2+3=9 and 9 is divisibile by nine so
so 2223 can be factored to equal
since it is divisible by 81.
so the next 22...3 will be divisible by nine is when the sum of the digits is divisivle by 9.
2222222222223 would be the next one...
since there are twelve 2's in the list it will be the number with twelve zero's
I hope this helps