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Synonyms for 21

the cardinal number that is the sum of twenty and one

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being one more than twenty

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References in periodicals archive ?
The ads are expected to reach 95 percent of adults, with an average of 21 ads shown by the end of the eight-week campaign -- for a total of 2.3 billion impressions, according to the companies.
The low-quantity clutter condition had only 21 ads that constituted 30 percent of all pages.
Since there were only 21 ads in the issue, 12 ads meant over 50 percent of the ads were intrusive.