Convert base-21 to base-3 Online | Free numbers Converter

-21 Number System

The base-21 number system, also called the unvigesimal system, is a positional numeral system that uses twenty-one symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, and J, where A represents ten, B eleven, C twelve, D thirteen, E fourteen, F fifteen, G sixteen, H seventeen, I eighteen, and J nineteen, and K twenty in decimal. Each digit’s position represents a power of 21, starting from $21^0$ at the rightmost digit and increasing to the left. For example, the base-21 number 3K7 equals $3 \times 21^2 + 20 \times 21^1 + 7 \times 21^0 = 1323 + 420 + 7 = 1750$ in decimal. Base-21 is primarily used in theoretical mathematics, number theory, and educational exercises to explore alternative numeral systems, positional notation, and arithmetic patterns. Understanding base-21 allows learners to perform arithmetic operations, convert numbers between bases, and analyze properties of non-decimal systems. Although rarely applied in computing or daily life, studying the unvigesimal system enhances logical reasoning, problem-solving skills, and comprehension of abstract number representations. It also provides a foundation for exploring higher-level numeral systems, coding theory, and mathematical research, helping learners understand efficient ways to represent and manipulate numbers in diverse bases.

Number System

The base-3 number system, also called the ternary system, is a positional numeral system that uses three digits: 0, 1, and 2. Each digit’s position represents a power of 3, starting from $3^0$ at the rightmost digit and increasing to the left. For example, the ternary number 102 represents $1 \times 3^2 + 0 \times 3^1 + 2 \times 3^0 = 9 + 0 + 2 = 11$ in decimal. Base-3 is used in certain computing and mathematical applications, especially where three distinct states are needed instead of just two, as in binary. Ternary logic can improve efficiency in some digital circuits and algorithms because it allows more information to be represented per digit. Understanding base-3 also helps in exploring alternative numeral systems and number theory concepts. It provides insight into how positional systems work, how different bases represent quantities, and how arithmetic operations can be adapted for non-binary systems. While not as commonly used as binary, decimal, or hexadecimal, base-3 has applications in specialized computing, coding theory, and mathematical research, offering unique advantages for efficient representation and processing of data.