MMDCCCXXI

MMDCCCXXI is the Roman numeral for the number 2821. It is constructed from the symbols M, D, C, X, I with additive placement: MM (2000) + D (500) + CCC (300) + XX (20) + I (1).

In Roman numerals, the largest numerals are placed to the left to represent larger values; subtractive notation such as IV for 4 or IX for 9 is used in other contexts, but 2821 does not require subtractive notation.

Usage: Roman numerals like MMDCCCXXI are used in specific contexts such as year designations, chapter numbering, or on clock faces. In modern usage, 2821 CE would be far in the future and not associated with established historical events; no widely recognized event is tied to this numeral.

Variants and related forms: The decimal 2821 can be converted to other numeral systems; conversely MMDCCCXXI can be parsed as 1000+1000+500+300+20+1.

See also: Roman numerals, numeral systems.