If you’re looking for the exact number of episodes Death Note has, here it is: 37 episodes (plus 2 recap specials and optional live-action/musical adaptations, but the main anime has 37).
Here’s a short review you can use or adapt, depending on the platform (e.g., Google, MyAnimeList, Reddit): cuantos cap tiene death note
37 episodes total for the anime. If someone tells you more or less, they’re counting OVAs, movies, or spin-offs. If you’re looking for the exact number of