The CAS Registry Mumber 111821-21-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,1,8,2 and 1 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 111821-21: (8*1)+(7*1)+(6*1)+(5*8)+(4*2)+(3*1)+(2*2)+(1*1)=77 77 % 10 = 7 So 111821-21-7 is a valid CAS Registry Number.
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