I am going to say that seeing one of Satan's personal numbers means He has plans for you NOW.
Start talking to Him. Don't wait. I have had my fair share of attacks and because of His protection I am still strong, and getting stronger, as He guides my way, Spiritual Advancement, and life entirely.
I see 11's daily, so this is your hint to try and talk to Him. Don't be discouraged if it seems like Satan is not talking immediately, He IS listening always. You can just talk to Him in your head, or aloud somewhere when you can have privacy, that's what I started doing. I have seen monumental changes in my life I did not expect entirely. He just took it when I asked for help.
These are the things Satan will do for those who genuinely ask, and are not selfish, or greedy looking for petty wishes.