Dynamics CRM 2016 (Online) WebAPI Query

I want to make string desc as int desc while using web api query.

ex) string desc -> 2, 10, 1
    int desc -> 10, 2, 1



Query : new_projects?$select=new_dt_start,new_txt_project_no&$orderby=new_txt_project_no desc

Is there any way?