Trying to learn about networks and discovered my router has several unexpected ports open

I decided to NMAP my local router and discovered there are several ports open that I do not think should be open.

PORT STATE SERVICE 21/tcp filtered ftp 53/tcp open domain 80/tcp open http 443/tcp open https 631/tcp filtered ipp 8080/tcp open http-proxy 49152/tcp open unknown

When I look at my router's backend I saw it said "Ports 22 and 443 are reserved by the service provider".

What is the reason for so many ports being open? I did not set up this router, it is just in my apartment.

This also occurs when i scan my global IP address, not the local IP.

Could someone from the outside world actually see all of these services offered by my router?