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Thor Bjorgolfsson and Kristin Olafsdottir at the Paul Allen Hosts VIP Party in honor of Dr. Jim Watson at the Octupus Boat during the 62nd International Cannes Film Festival on May 22, 2009 in Cannes, France.Michael Buckner/Getty Images
But some countries, such as Iceland, Portugal, and Qatar, are home to only one billionaire.
Business Insider scoured Forbes' billionaires list to determine which nations have just one billionaire and then compared each billionaire's wealth to the country's GDP.
In Liechtenstein, the country's only billionaire is worth almost half of the GDP of the whole country.
Most of these ultra-wealthy individuals are concentrated in countries like the US, China, Germany, Russia, and the United Kingdom. The US is home to the highest number of billionaires: an estimated 705. That's followed by China with an estimated 285 billionaires, and Germany with 146.
Some countries, however, are home to just one billionaire. Business Insider scoured Forbes' billionaires ranking to find which nations have just one billionaire, and then compared each billionaire's wealth to the gross domestic product (GDP) of the country, based on data from the World Bank.
In Liechtenstein, for example, the country's only billionaire is worth almost half of the GDP of the whole country. And the richest man in Eswatini (formerly Swaziland) is actually worth about $600 million more than his country's GDP.
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Here are 13 countries that have only one billionaire.
Rebrab is the founder and CEO of Algeria's largest privately-held company, Cevital, which owns one of the world's largest sugar refineries. The company also owns an Italian steel mill, a French appliances maker, and a German water purification company.
Dos Santos is the oldest daughter of Angola's former president, Jose Eduardo dos Santos, who left office in 2017. According to Forbes, Dos Santos acquired stakes in Angolan companies like banks and a telecom firm during her father's presidency.
Ivanishvili amassed his fortune in Russia in the metals and banking industries before moving back to Georgia in 2013. He served as Georgia's prime minister for 13 months in 2012 and 2013.
He has investments in Polish and Chilean telecom companies, cryptocurrencies, and startups including Zwift, BeamUp, and Deliveroo. Björgólfsson went almost completely broke during the 2008 recession when he had to pay off more than $1 billion in debt.
Alghanim is the chairman of Alghanim Industries, a conglomerate founded by his father in the 1930s. The company sells General Motors and Ford cars in Kuwait and owns other businesses, including Wendy's restaurants in the Middle East.
Zeller is the former CEO and now a supervising board member of Ivoclar Vivadent AG, a Lichtenstein-based dental products company with offices in 25 countries. Zeller's grandfather, Dr. Adolph Schneider, bought the company in 1948. Zeller served as CEO from 1990 to 2003.
Amorim was married to Americo Amorim. After he died in 2017, she and her three daughters inherited his fortune, which was made in the family's cork business, Corticeira Amorim, as well as international investments in energy and banks.
She has an estimated 18% stake in Galp Energia, a Portuguese oil and gas company.
Dewji is the CEO of METL, a Tanzanian conglomerate that deals in textile manufacturing, flour milling, beverages, and edible oils in at least six African countries. His father founded the company in the 1970s.
He also owns more than half of Liquid Telecom, a private company that supplies fiber optic and satellite services to telecom companies throughout Africa.
