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21 is a number that comprises the sequence of digits 2 & 1 of the Arabic Numeral System; the most widely used numeral system in the world. The number 21 first appeared on SESAME STREET in 1986 (when sponsor numbers below 2 & above 12 were first permitted). In total, the number 21 has sponsored episodes, both of which first aired in the mid-1990s. It remained the highest number to sponsor an episode of SESAME STREET for several years, until producers chose the number 40 as a special feature in episode 4187 (the season 40 premiere).





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