De Vries takes number 21 and Honda name returns on FIA’s 2023 F1 entry list | 2023 F1 season

Nyck de Vries has chosen the race number 21 for his full-time Formula 1 debut with AlphaTauri next year.

Source: https://www.racefans.net/2022/12/15/de-vries-to-take-over-gutierrezs-number-21-for-f1-debut-in-2023/