Alright, let's work through 2157 times 5782 step by step
2157 × 5782 = 5782 × (2157)
+ 5782 × 7 which equals 40474
+ 5782 × 50 that results in 289100
+ 5782 × 100 that results in 578200
+ 5782 × 2000 producing 11564000

= 12471774
