The Roman numeral MMCXXIII represents the number 2123. Here’s the breakdown of how this numeral is formed:

1. 2000 in Roman Numerals: The Roman numeral for 2000 is MM. M represents 1000, so MM is 1000 + 1000 = 2000.
2. 100 in Roman Numerals: The Roman numeral for 100 is C. So, adding this to the previous total gives us 2100.
3. 20 in Roman Numerals: The Roman numeral for 20 is XX. X represents 10, so XX is 10 + 10 = 20. This brings our total to 2120.
4. 3 in Roman Numerals: The Roman numeral for 3 is III. I represent 1, so III is 1 + 1 + 1 = 3.

Adding all these together, MMCXXIII (2000 + 100 + 20 + 3) equals 2123.

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