WWF SmackDown - 1999 5-21 was released on:
USA: 12 February 2004
Passions - 1999 1-521 was released on: USA: 16 July 2001
Sunset Beach - 1997 1-521 was released on: USA: 3 February 1999
The Bold and the Beautiful - 1987 1-521 was released on: USA: 1989
Days of Our Lives - 1965 1-521 was released on: USA: 29 November 1967
Attack of the Show - 2005 1-521 was released on: USA: 4 June 2007
Ryan's Hope - 1975 1-521 was released on: USA: 11 July 1977
Santa Barbara - 1984 1-521 was released on: USA: 15 August 1986
Late Night with Jimmy Fallon - 2009 1-521 was released on: USA: 11 October 2011
Green Screen Adventures - 2007 Show 521 5-21 was released on: USA: 1 December 2012
It is: 1*521 = 521 which is a prime number
The positive integer factors of 521 are: 1, 521
decimal for 521 percent = 5.21521% = 521%/100% = 5.21