4.21 × 10-7 written in standard notation is 0.000000421
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By Pythagoras's theorem, to make a right angled triangle, 142 + 152 should be 212 But 142 + 152 = 196 + 225 = 421 whereas 212 = 441 So these three sides cannot make a right angled triangle.
421,035 = (4 x 105) + (2 x 104) + (1 x 103) + (0 x 102) + (3 x 101) + (5 x 100) OR (4 x 100000) + (2 x 10000) + (1 x 1000) + (0 x 100) + (3 x 10) + (5 x 1)