Algolia's search engine does not have settings to treat numerals and numbers in the same way (for example, searching for "iPhone 13" using the query "iPhone thirteen"). Therefore, the basic strategy is to create synonyms for these expressions.
We have a public repository with CSV versions of these files, so you don't have to create the dictionaries yourself. You can find them here.
You can import these synonyms by uploading the CSV file to any Algolia indices you'd like. Instructions for doing that can be found in this documentation.