What is the smallest banknote in circulation and its value in USD?

Question: What is the smallest banknote in circulation and its value in USD?

Answer: The smallest banknote in circulation is the 1000 Iranian rial note, which is worth around $0.02 USD.

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What is the most valuable banknote in circulation and how much is it worth in USD?

What is the highest-denominated coin ever minted and how much does it weigh?