In the overall rich list of world's billionaires, as per an annual ranking published today by business magazine Forbes, Mukesh Ambani is ranked 22nd, while the second-richest Indian Lakshmi Mittal is at 41st position with a net worth of $16.5 billion.
Mr Slim has topped the rankings with a net worth of $73 billion, followed by Bill Gates ($67 billion), Spain's Amancio Ortega ($57 billion), Warren Buffett ($53.5 billion) and Larry Ellison ($43 billion) in top five.
There are a total 55 billionaires from India on the list of 1,426 persons from across the world having a minimum net worth of $1 billion.
Among the Indians, Mukesh Ambani and Lakshmi Mittal are followed by Azim Premji, Dilip Shanghvi, Shashi & Ravi Ruia, Kumar Mangalam Birla, Savitri Jindal, Sunil Mittal, Shiv Nadar, K P Singh and Anil Ambani.
Globally, Anil Ambani is ranked 233rd ($5.2 billion), while the global top-100 list has only three Indians -- Mukesh Ambani, Lakshmi Mittal and Azim Premji (91st position).