How can I mute the ringer & vibration on a call/sms coming from specific number?

You can easily mute single contacts - just make a *.wav, *.mp3 or other sound file, that has silence in it, send it to the phone and then just assign the contact to the "empty" sound file.

I don't know how to disable vibration for a single contact, but you can make something that will cause an effect of disabling any notification of an incoming call. Just use "blacklist" program - you can block a person, and for the blocking time, you won't receive any notifications (I doesn't work with messages, if my memory's right)

So you've got to search for a software with function like that (of course if it's possible to make such a program, and somebody will create it)

On ur contacts, create a group name. Add contacts that u want to mute to that group. Create or modify a profile. Unchecked the group u've created for "Alert for" on profile. that's it 😉