公元：：八二一年

• Traditional Chinese Character(HanT): 公元：：八二一年
• Simplified Chinese Character(HanS): 公元：：八二一年
• Bopomofo(Mandarin Phonetic Symbols): ㄍㄨㄥ ㄩㄢˊ ㄅㄚ ㄦˋ ㄧ ㄋㄧㄢˊ (ㄍㄩㄅㄦㄧㄋ)
• Bopomofo(Zhuyin Keyboard Input/IME): "ej/ m0618 -4u su06" (ej/m0618-4usu06)
• (ASCII) Hanyu Pinyin: "gongyuanbaeryinian" "Gong1Yuan2Ba1Er4Yi1Nian2" "Gong1 Yuan2 Ba1 Er4 Yi1 Nian2" (GYBEYN)
• (Latin) Hànyǔ Pīnyīn: YuánBāèrYī [ Yuán Bā èr Yī ]
• (英文翻譯) English Translation: "AD: 821"
• (西語翻譯) Traducción Español: "Anuncio::821"
• (日文翻譯) 日本語翻訳: "西暦::821"