221909-12-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221909-12-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,9,0 and 9 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 221909-12:
(8*2)+(7*2)+(6*1)+(5*9)+(4*0)+(3*9)+(2*1)+(1*2)=112
112 % 10 = 2
So 221909-12-2 is a valid CAS Registry Number.