21st prime is 73

21st prime is 73.

73 is 21st prime.

Learn more about Prime numbers.

Neighbours#

23₃₂	29₁₅	31₁₉	37₁₉	41₁₉
43₁₃	47₂₂	53₁₉	59₁₃	61₁₃
67₁₈	71₁₄	73₁₈	79₁₄	83₁₁
89₉	97₂₁	101₂₀	103₁₆	107₂₁
109₂₁	113₂₂	127₁₄	131₁₃	137₉

Compare with#

23₃₂	29₁₅	31₁₉	37₁₉	41₁₉
43₁₃	47₂₂	53₁₉	59₁₃	61₁₃
67₁₈	71₁₄	73₁₈	79₁₄	83₁₁
89₉	97₂₁	101₂₀	103₁₆	107₂₁
109₂₁	113₂₂	127₁₄	131₁₃	137₉

Learn more about Prime numbers
Check first 50 primes
Check primes up to 100
Check all primes

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