my math is this:

21 million coins divided by world total adult population, which is just over 5 billion.

so

21 million / 5,298,564,000 = 0.00396 btc

the world average wealth

is $8360 USD.

so

roughly in today's numbers,

$8360 USD = 0.00396 BTC

1 BTC / 0.00396 BTC = 252

252 * $8360 USD = 2.1 million USD

rounded here of course but check Wikipedia's wealth numbers..

but that's the math.

https://en.m.wikipedia.org/wiki/List_of_countries_by_wealth_per_adult

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