Alright, let's work through 4151 times 5247 step by step
4151 × 5247 = 5247 × (4151)
+ 5247 × 1 what gives us 5247
+ 5247 × 50 that equals 262350
+ 5247 × 100 what gives us 524700
+ 5247 × 4000 that is equal 20988000

= 21780297
