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The net worth of every person on the planet adds up to $135.5 trillion.

To put that in perspective, when you divide it by the population of the world, you get an average net worth of $19,000. That's just barely enough for every person to buy a used 2012 Honda Accord with 50,000 miles on it.

This is just one of many facts revealed in a recent report by The Boston Consulting Group. Another interesting tidbit is that there are 13.8 million millionaire households in the world today.

Spurred on by rising equity indexes -- the S&P 500 (SNPINDEX:^GSPC) is up by 37% over the past two years alone -- the United States retained its convincing lead with 5.9 million millionaire households, or 43% of the total. Japan came in a distant second with 1.5 million millionaire households, or 11%.

In light of our collective fascination with the world's wealthiest people, I thought you'd find the rest of this list interesting. What follows, in turn, is a slideshow revealing the 10 countries with the largest number of millionaire households in the world.

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