Alright, let's work through 12999541 times 45236699 step by step
12999541 × 45236699 = 45236699 × (12999541)
+ 45236699 × 1 what gives us 45236699
+ 45236699 × 40 what gives us 1809467960
+ 45236699 × 500 that equals 22618349500
+ 45236699 × 9000 producing 407130291000
+ 45236699 × 90000 resulting in 4071302910000
+ 45236699 × 900000 which equals 40713029100000
+ 45236699 × 2000000 that equals 90473398000000
+ 45236699 × 10000000 yielding 452366990000000

= 588056323355159
