Currently there is no out-of-box feature available in PowerApps and Flow to convert a numerical value into word and hence this blog walks you through how to build one.
Here is a link to the article which also contains a copy of the MSAPP file you can download and use.
https://powerusers.microsoft.com/t5/PowerApps-Community-Blog/Number-to-word-conversion-tool/ba-p/258621
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PowerApps number to word conversion tool | NatokHD