21
positive integer, deficient number, triangular number, odd number, centered pentachoric number, octagonal number, highly touchable number, Fibonacci number, composite number, harshad number| Name in hiero markup | V20-V20-Z1  |
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| Follows | 20  |
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| Followed by | 22  |
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| Prime factor | 3, 7  |
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| Unicode character | ㉑  |
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21 (Kò-Bolo GAamodi) nbozini dalbo Kò-Bolo 20 dede Kò-Bolo GA bolo.