Who are the World’s Richest?

The number 13 has long been considered unlucky by superstitious people around the globe. How fitting, then, that Bill Gates's reign as the world's richest person ends after his 13th year at the top.

Despite being worth $58 billion, $2 billion more than last year, Gates is now just the world's third-richest person, ceding the top spot ranking to his good friend and partner in philanthropy, Warren Buffett, whose net worth jumped $10 billion to $62 billion.  (All stock prices and net worth valuations were locked in on Feb. 11.)  Ranked No. 2 is Mexican telecom tycoon Carlos Slim Helú, whose fortune has doubled in just two years to $60 billion.

It is certainly a dawning of a new era. But not just because of Gates's fall. The 22nd annual rankings of the World's Billionaires reflects all sorts of upheavals in the list's makeup. Two years ago, half of the world's 20 richest were from the U.S. Now only four are. India wins bragging rights for having four among the top 10, more than any other country.

For the first time ever, the number of billionaires Forbes could identify crossed into four figures, reaching 1,125. The total net worth of the group is $4.4 trillion, up $900 billion from last year. Despite the turbulence in the U.S. markets, Americans account for 42 percent of the world's billionaires and 37 percent of the total wealth; those shares are down two and three percentage points, respectively, from last year.

Sixteen years after the collapse of the Soviet Union, Russia, with 87 billionaires, is the new No. 2 country behind the U.S., easily overtaking Germany, with 59 billionaires, which held the honor for six years.