I'm sure in its peak IBM employed way more than that including their India and China teams.
EDIT: found a source, 130K in india in 2017... == 33% of workforce
"Today, the company employs 130,000 people in India — about one-third of its total work force, and more than in any other country. Their work spans the entire gamut of IBM’s businesses, from managing the computing needs of global giants like AT&T and Shell to performing cutting-edge research in fields like visual search, artificial intelligence and computer vision for self-driving cars. One team is even working with the producers of Sesame Street to teach vocabulary to kindergartners in Atlanta."
Yeah I mentioned US for that reason. If you include the Indian outsourcing shops then clearly there would be numerous. Honesty though calling them developers is a bit too much. Most of them are used as benchwarmers to inflate numbers and get deals.
