It is not obvious but the rsync --help

 rsync --help|grep port
     --port=PORT             specify double-colon alternate port number

--port does not do anything at all actually for some strange reason it still uses 22

You have to specify a manual ssh command to make it work:

-e 'ssh -p 2210'

The snippet above is what you add for port 2210 change it to whatever port you need.

Full Example Below of Rsync using an alternative port number:

rsync -Phaz -e 'ssh -p 2210' /somedir/ root@somehost.com:/someremotedir
 

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