According to the search results, the country with the most millionaires is the United States, with 25.58 million millionaires as of 2021. China comes in second place with 6.19 million millionaires. Other countries with a high number of millionaires include Japan, the United Kingdom, and France. It is important to note that the number of millionaires in a country does not necessarily reflect the overall wealth or economic status of the country.