21873-20-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21873-20-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,7 and 3 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21873-20:
(7*2)+(6*1)+(5*8)+(4*7)+(3*3)+(2*2)+(1*0)=101
101 % 10 = 1
So 21873-20-1 is a valid CAS Registry Number.