Roman Numerals

# Roman Numerals: 421 = CDXXI

## Convert Roman Numerals

Arabic numerals:
Roman numerals:
 Arabicnumerals 0 1 M C X I 2 MM CC XX II 3 MMM CCC XXX III 4 CD XL IV 5 D L V 6 DC LX VI 7 DCC LXX VII 8 DCCC LXXX VIII 9 CM XC IX

The converter lets you go from arabic to roman numerals and vice versa. Simply type in the number you would like to convert in the field you would like to convert from, and the number in the other format will appear in the other field. Due to the limitations of the roman number system you can only convert numbers from 1 to 3999.

To easily convert between roman and arabic numerals you can use the table above. The key is to handle one arabic digit at a time, and translate it to the right roman number, where zeroes become empty. Go ahead and use the converter and observe how the table shows the solution in realtime!

## Current date and time in Roman Numerals

 2024-08-15 16:54:10 MMXXIV-VIII-XV XVI:LIV:X

Here is the current date and time written in roman numerals. Since the roman number system doesn't have a zero, the hour, minute, and second component of the timestamps sometimes become empty.

## The year 421

Here you can read more about what happened in the year 421.

## The number 421

The number 421 is a prime number.

421 as a binary number: 110100101
421 as an octal number: 645
421 as a hexadecimal number: 1A5

## Numbers close to 421

Below are the numbers 418 through 424, which are close to 421. The right column shows how each roman numeral adds up to the total.

 418 = CDXVIII = 500 − 100 + 10 + 5 + 1 + 1 + 1 419 = CDXIX = 500 − 100 + 10 + 10 − 1 420 = CDXX = 500 − 100 + 10 + 10 421 = CDXXI = 500 − 100 + 10 + 10 + 1 422 = CDXXII = 500 − 100 + 10 + 10 + 1 + 1 423 = CDXXIII = 500 − 100 + 10 + 10 + 1 + 1 + 1 424 = CDXXIV = 500 − 100 + 10 + 10 + 5 − 1