It's challenging to provide an exact number of mountains in the world because the classification of what constitutes a "mountain" can vary. The Earth has an extensive range of topographical features, and mountains come in various sizes. There are well-known mountain ranges and smaller, less prominent peaks.
To give you an idea, the Himalayas, one of the most famous mountain ranges, have more than 50 peaks exceeding 23,000 feet (7,000 meters) in height. However, if we consider all mountains, including smaller ones, hills, and other elevated landforms, the number would be significantly higher.
It's important to note that new mountains can be discovered, and geological processes can change the landscape over time. As a result, there is no definitive count of all the mountains in the world, but they are numerous and diverse.