Properties of the Number 42021

Forty-Two Thousand Twenty-One

Basics

Value: 42020 → 42021 → 42022

Parity: odd

Prime: No

Previous Prime: 42019

Next Prime: 42023

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 23 × 29

Divisors: 1, 3, 7, 9, 21, 23, 29, 63, 69, 87

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1010010000100101

Octal: 122045

Duodecimal: 20399

Hexadecimal: a425

Square: 1765764441

Square Root: 204.99024367027812

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

Number of sets of positive integers with arithmetic mean n. A66571

Numbers n such that n² can be represented as sum of (at least two) consecutive cubes and n is not a triangular number. A163393

Number of bipartite partitions of n white objects and 3 black ones. A412

a(n) = A061037(7·n+2). A165943

Fifth column of (1,5)-Pascal triangle A096940. A96942

a(n) = 5ⁿ mod 2ⁿ. A29757

a(n) = 100·n² + 100·n + 21. A152161

The stonemason's problem: numbers n such that n² is the sum of more than three consecutive cubes, the cube 1 being disallowed. A238099

n written in fractional base 6/4. A24637

a(n) = (8·n+3)*(8·n+7). A146301