21

21 (twenty-one) is a number in the Arabic numeral system.
The number 21 first appeared on Sesame Street in 1988 (when sponsor numbers above 12 were first permitted). The number 21 has sponsored only three episodes: Episodes 3073, 3148, and 3412 (a repeat of 3148), all 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).
==Segments about 21==
File:Ernie12poem.jpg|Ernie's "12 and 21" poem
File:Numberella.jpg|Numberella
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#21