4021

4021 is a natural number that follows 4020 and precedes 4022. It is prime, having exactly two positive divisors: 1 and 4021.

In decimal notation, it is written as 4021. Its binary representation is 111110110101; in octal it is 7665, and in hexadecimal it is FB5. It is congruent to 1 modulo 4 and is an odd number.

As a prime, 4021 has no nontrivial factorization. Its primality is a standard example in introductory number theory for illustrating primality testing and modular arithmetic. The square root of 4021 is approximately 63.4, which implies that any potential factor would have to be 63 or smaller; none exist, confirming its primality.

In broader contexts, 4021 may appear as a year designation in future history or as a sequential identifier in systems that assign numbers, but there is no widely recognized historical event, theorem, or object uniquely associated with the number 4021.