Mexico's Carlos Slim remains the world's richest man for the fourth year in a row, according to Forbes magazine, while Warren Buffett dropped out of the top three for the first time since 2000.
Facebook's Mark Zuckerberg saw his ranking drop 31 spots as his net worth declined by $4.2 billion.
A record 1,426 people around the world made Forbes magazine's latest annual count of billionaires, up 16% from last year.
Their average net worth was $3.8 billion, rising 3% from 2012.
The total net worth for the list's billionaires was $5.4 trillion, compared with $4.6 trillion a year ago.
The US continued to be home to the most billionaires in the world, with 442 of them. It was followed by the Asia-Pacific region, with Europe rounding out the top three.
Irish citizens on the list include Denis O'Brien, who has a ranking at 233 with a net worth of $5.2 billion, the owner of Glen Dimplex Martin Naughton, who comes in at 736 and who is worth $2 billion, and Dermot Desmond, who comes in 831 place with a net worth of €1.8 billion.
The richest Irish citizen on the list is Pallonji Mistry, who is placed at 103 with a net worth of $10.5 billion. He is based in India but holds an Irish passport due to the Irish citizenship of his wife and sons.
There were 210 new faces on the new list, with Forbes saying many were helped by rebounding equity markets and strong consumer brands.
Slim's net worth increased to $73 billion from $69 billion a year earlier. Bill Gates of Microsoft held on to second place with a net worth of $67 billion.
Berkshire Hathaway's Buffett slipped to the fourth spot with a $53.5 billion net worth. Buffett was surpassed by Spanish clothier Amancio Ortega, who jumped two spots from 2012 with a net worth of $57 billion.
While Buffett dropped in the rankings, he added $9.5 billion to his net worth - making him the second-biggest gainer of the year. The largest gainer was Ortega, who added $19.5 billion to his net worth.
There were 138 women on the list, up from 2012's 104. Liliane Bettencourt - whose family owns a stake in L'Oreal - is the world's richest woman with a net worth of $30 billion. Brazil's Eike Batista had the biggest drop in his net worth, with it declining $19.4 billion from the previous year.
Facebook's Zuckerberg saw his net worth fall to $13.3 billion from $17.5 billion. His ranking fell to number 66 from number 35 in 2012.
