Properties of the Number 18021

Eighteen Thousand Twenty-One

Basics

Value: 18020 → 18021 → 18022

Parity: odd

Prime: No

Previous Prime: 18013

Next Prime: 18041

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 6007

Divisors: 1, 3, 6007, 18021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011001100101

Octal: 43145

Duodecimal: A519

Hexadecimal: 4665

Square: 324756441

Square Root: 134.24231821597837

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

Positions of zeros in A165597. A165598

Number of factorization patterns of polynomials of degree n over F₄. A6169

Number of (w,x,y,z) with all terms in {1,...,n} and 3w=x+y+z+n. A212247

Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w²>x²+y². A211810

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 68 ones. A31836

Number of minimal edge covers in the n-double cone graph. A379182

a(n) = floor(C(4n,2n)/C(4n,n)). A24501

Powers of cube root of 16 rounded down. A18021