Alright, let's work through 1521 times 873 step by step
1521 × 873 = 873 × (1521)
+ 873 × 1 that equals 873
+ 873 × 20 producing 17460
+ 873 × 500 resulting in 436500
+ 873 × 1000 that is equal 873000

= 1327833
