I can only guess that "2014" is a typo. Harry Potter and the Deathly Hallows was first published in 2007; the two films that were based on it were released in 2010 and 2011 respectively. Wikipedia tells us that "It holds the Guinness World Record for most novels sold within 24 hours of release, with 8.3 million sold in the US alone and 2.65 million in the UK" (Note Wikipedia's US–centric use of the word "alone" in respect of US sales.)
According to Forge Today, "The grand finale of the Harry Potter series, where [spoiler alert!] Harry and his arch–enemy Voldemort battle for the last time, smashed records as the fastest selling book of all time. Harry Potter and the Deathly Hallows sold more than 15 million copies in 24 hours and is the second bestselling book in history, behind only Dan Brown's The Da Vinci Code."
I'm guessing that in reality it hasn't outsold the Bible just yet – although I may be wrong.
(Forge Media is "a volunteer run media outlet within the University of Sheffield's Students Union.")
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