the number 11 is associated with Angels
Absolutely nothing. The very fact that you wrote this shows that you take notice when you look at the clock at 11. This means you will remember it better than all the other non 11 o'clock times you look at your clock. Also, it could be something like that's when you go to bed, or when your favourite TV show ends or something like that.
Depends an where it is. If it's before the colon (11:) it's the Eleventh hour (See Doctor Who) After the colon (:11) it's eleven minutes after the hour.
It's a very common thing since the advent of non analogue clock faces for people to compare about this being noticed. And it seems the more we talk about it the more it happens. otoh in digital (another way of saying binary math) 11 is equivalent to the number 3. There are so many possibilities in the realm of reality of this so called coincidence happening from some external cause is possible, we are after all on the third orbital planet from the sun. It takes 2 people to make a third. Christianity is a triune belief system. Etc. Nobody can really say so it's probably not worth worrying about.
They are "time prompts" to let us know we are being helped from beyond the veil. There's a group called 11:11, I've been reading their messages of hope and encouragement for years. You can sign up. They call them selves "light workers," and "midwayers."