javascript - parseInt changes the integer -

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I am trying to draw a number (721576481415319 78 ), which is 21 characters Begins with the title of such a page: 

  parseInt (document.title.substring (21), 10);   
 This string gives the integer as 721576481415319  80 . I can not seem to know why this is changing the last two numbers. Any help would be appreciated.   
 
 
 According to the maximum value of an integer is 9007199254740992.  
 I tried your calculation and I can confirm your problem.  
 It looks like parsing beyond this maximum value and it is rounding the previous 2 figures.

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