Among the study's other findings:
- There are more of these lucky folks this year than there were last. BCG counted 12.5 million households with at least $1 million in investable assets, some 12.2 percent more than last year.
- The United States has the most millionaire households (not surprising, perhaps, given the country's large population). There are 5.2 millionaires in the U.S. The runners-up are Japan, with 1.5 million and China with 1.2 million. The United Kingdom and Germany follow.
- Singapore has the most millionaires given its population. Some 15.5 percent of households in Singapore have $1 million in investable assets. Singapore is also the country where the millionaire population is growing most swiftly. There are about 170,000 millionaire households in Singapore, up by nearly a third from last year.
- Switzerland comes in second in millionaires-per-capita---9.9 percent of its population are millionaires.
This year, for the first time, Boston Consulting Group compiled data on people it describes as ultra-high-net-worth households, or those with more than $100 million to invest.
- The United States has more super-wealthy than any other country. Some 2,692 U.S. households have more than $100 million.
- Measured by super-rich-people-per-capita, Saudi Arabia has the most ultra-rich households of any country. Some 18 per 100,000 households qualify. Second place goes to Switzerland (10 super-rich households per 100,000), followed by Hong Kong (9), Kuwait, (8) and Austria (8).
- China has the fastest-growing superrich population. It's got 393 households with more than $100 million to invest, which is more than 30 percent more than it had last year.
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Kimberly Weisul is a freelance writer, editor and editorial consultant. Follow her on twitter at www.twitter.com/weisul.