In case you have a new contact on your icq list (or miranda or qip or whatever you use), and this contact has the icq number (icq uin) of 12111, be assured it is NOT a virus, NOT a bot or trojan or whatever. It is a newly added support contact from icq.
You can read more about that on the ICQ website “help”.
So- no worries, just delete it if you want or keep it.