S'annu 1821 (MDCCCXXI in nùmeros romanos) est un annu incomintzadu lunis segundu su calendàriu gregorianu.
| XVIII sèculu - XIX sèculu - XX sèculu | ||
| annos 1800 - annos 1810 - annos 1820 - annos 1830 - annos 1840 | ||
| 1817 - 1818 - 1819 - 1820 - 1821 - 1822 - 1823 - 1824 - 1825 |
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