Alright, let's work through 5310 times 4004 step by step
5310 × 4004 = 4004 × (5310)
+ 4004 × 0 yielding 0
+ 4004 × 10 what gives us 40040
+ 4004 × 300 that results in 1201200
+ 4004 × 5000 that is equal 20020000

= 21261240
