This number is a prime.
(12*37*21*73)-(12+37+21+73)=680509. Note that 12th prime is 37 and 21st prime is 73. [Wiszowaty]
(12*37*21*73)-(12+37+21+73)=680509. Note that 12th prime is 37 and 21st prime is 73. [Wiszowaty]