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I read through the documentation but didn't find an answer, I tried to use the lightning-formatted-number element, but it's only used for display and can't be edited as far as I can tell.
You can Just Set the step as "0" like
<lightning-input type="number" name="input7" label="Number field with currency formatter" value="123" formatter="currency" step="0"></lightning-input>
Required, but never shown