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Is 21,000,000 nanograms as heavy as a US Quarter?

It's about one-two-hundred-fiftieth as heavy as a US Quarter
The weight of a US Quarter is about 5,670,000,000 nanograms.
(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 5,670,000,000 nanograms each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
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