1821
Everything about the number 1821 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 1821
| Nominal | 1821 |
| Cardinal | one thousand eight hundred twenty-one |
| Ordinal | 1,821st |
| This number as US currency | one thousand eight hundred twenty-one dollars |
Properties (and some facts) of 1821
| Is 1821 an odd number? | 1821 is an odd number |
| Is 1821 an even number? | 1821 is not an even number |
| Is 1821 a palindrome? | 1821 is not a palindrome |
| Is 1821 a triangle number? | 1821 is not a triangle number |
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1821 in other bases
| Base 2 (Binary) | 11100011101 |
| Base 3 (Ternary) | 2111110 |
| Base 4 (Quaternary) | 130131 |
| Base 5 (Quinary) | 24241 |
| Base 6 (Senary) | 12233 |
| Base 8 (Octal) | 3435 |
| Base 12 (Duodecimal) | 1079 |
| Base 16 (Hexadecimal) | 71D |
| Base 20 (Vigesimal) | 4B1 |
Primes and factors tests for 1821
| Is 1821 a prime number? | 1821 is not a prime number |
| Is 1821 a perfect number? | 1821 is not a perfect number |
| Is 1821 a Mersenne prime? | 1821 is not a Mersenne prime |
| Is 1821 a Fermat prime? | 1821 is not a Fermat prime |
| Is 1821 a Fibonacci prime? | 1821 is not a Fibonacci prime |
| Is 1821 a partition prime? | 1821 is not a partition prime |
| Is 1821 a Pell prime? | 1821 is not a Pell prime |
| Prime Factors | Prime factors of 1821 |
1821 in other numeral systems
| 1821 in Roman numerals | MDCCCXXI |
| 1821 in Chinese numerals | 壹仟捌佰貳拾壹 |
| 1821 in Babylonian numerals |   |
| 1821 in Egyptian numerals | 𓆼𓍩𓎇𓏺 |
Roots and squares for 1821
| Is 1821 a square number? | 1821 is not a square number |
| Is 1821 a cube number? | 1821 is not a cube number |
| Square root of 1821 | 42.673176586704 |
| Cube root of 1821 | 12.211527222018 |
Recreational math for 1821
| Number 1821 reversed | 1281 |
| Sum of the digits | 12 |
| Number of digits | 4 |
Arithmetic tables for 1821
Other pages about 1821
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