Properties of the Number 2021

Two Thousand Twenty-One

Basics

Value: 2020 → 2021 → 2022

Parity: odd

Prime: No

Previous Prime: 2017

Next Prime: 2027

Digit Sum: 5

Digital Root: 5

Palindrome: No

Factorization: 43 × 47

Divisors: 1, 43, 47, 2021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11111100101

Octal: 3745

Duodecimal: 1205

Hexadecimal: 7e5

Square: 4084441

Square Root: 44.955533585978046

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Products of 2 successive primes. A6094

a(n) = n² - 4. A28347

Numerator of 1/4 - 1/n². A61037

Coordination sequence for 3D uniform tiling formed by stacking parallel layers of the 4.6.12 2D tiling (cf. A072154). A299258

Partial sums of A008137. A299276

Numbers whose sum of digits is 5. A52219

a(n) = n concatenated with n + 1. A1704

a(n) = n² + n + 41. A202018

Fundamental discriminants of real quadratic number fields with class number 3. A94612

MM-numbers of labeled graphs with loops spanning an initial interval of positive integers. A320461

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