Check the properties of a positive integer to enter the number in the search box. If you input two numbers separated by a space, the properties of the pair like GCD are shown. If you separate two numbers by a comma, the sequences containing those numbers are listed.

(9, 21)

A = 9

B = 21

Sum 30
Difference 12
A × B 189
A ÷ B 0.42857142857142855
B ÷ A 2.3333333333333335
GCD 3
LCM 63
Average 15

Combination

293930

\[ {}_{ 21 } C_{ 9 } = 293930 \]

Sum of squares

522

\[ 9^2 + 21^2 = 522 \]

Norm

$\sqrt{ 9^2 + 21^2 } = 22.847319317591726$

Geometric mean

13.74772708486752

(9, 21) is amicable?

No

Stirling number of the first kind

0

\[ S(9,\ 21) = 0 \]

Stirling number of the second kind

0

\[ S(9,\ 21) = 0 \]

Jacobi symbol

0

\[ \left(\dfrac{ 9 }{ 21 }\right) = 0 \]

Properties of 9 and 21

Properties of 9 and 21: The GCD and LCM of 9 and 21 are 3 and 63 respectively. 9 + 21 = 30, |9 - 21| = 12, 9 * 21 = 189, 9 / 21 = 0.42857142857142855, 21 / 9 = 2.3333333333333335. The average of 9 and 21 is 15 and the norm of them is 22.847319317591726. The geometric mean of two numbers is 13.74772708486752.

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