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521 kilograms is about 100,000,000 times as heavy as a Grain of Sand.
In other words, it's 120,000,000 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.00000000830 times that amount.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
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