According to the search results, the population of Mumbai varies depending on the source and the year. However, the most recent and reliable estimates suggest that:

• The estimated city proper population of Mumbai in 2023 is 12.5 million (1.25 crore) .
• The current metro area population of Mumbai in 2023 is 21,297,000.
• Mumbais 2023 population is now estimated at 21,296,517.
• In 2023, the population of Mumbai was about 21 million inhabitants.
• Mumbai Population in 2023 is 27.18 Million (2.78 Crores) .
• The current estimated population of Mumbai city in 2023 is 17,159,000, while Mumbai metro population is estimated at 25,368,000.

Therefore, the population of Mumbai in 2023 is estimated to be between 12.5 million and 27.18 million, depending on the source.