The "2021 117 23 MB" reference refers to an old, likely outdated version of a modded file that circulated in 2021. Not on Official Stores:
Practical safety guidance
Unlike the official app, which receives regular security patches, these mods are static and vulnerable to exploits. Platform Integrity and Content Moderation tik tok 18 plus apk 117 23 mb 2021
Using modified APKs like the TikTok 18+ version carries inherent dangers that can compromise your device and personal data. Tik Tok 18 Plus Apk 117 23 Mb 2021 The "2021 117 23 MB" reference refers to
The legitimate TikTok app already provides tools for mature audiences and content creators to manage adult-oriented material without needing a separate APK: Audience Controls which receives regular security patches