Properties of the Number 21384

Twenty-One Thousand Three Hundred Eighty-Four

Basics

Value: 21383 → 21384 → 21385

Parity: even

Prime: No

Previous Prime: 21383

Next Prime: 21391

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ⁵ × 11

Divisors: 1, 2, 3, 4, 6, 8, 9, 11, 12, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001110001000

Octal: 51610

Duodecimal: 10460

Hexadecimal: 5388

Square: 457275456

Square Root: 146.23269128344728

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

Numbers n such that there exists an x≠n that makes {n,n,x} an amicable multiset. A259302

Numbers that belong to at least one amicable multiset. A259307

Numbers that are not a power of a prime but whose prime indices satisfy (mean) = (median) = (mode), assuming there is a unique mode. A363729

Square array read by antidiagonals downwards: super Patalan numbers of order 3. A248324

Coordination sequence for D₄ lattice. A7900

"DHK[ 8 ]" (bracelet, identity, unlabeled, 8 parts) transform of 1,1,1,1,... A32249

Number of 4-way intersections in the interior of a regular 6n-gon. A137938

Numbers with prime factorization pq^3r^5. A190011

a(n) = 4·n*(floor(n²/2)+1). For n >= 3, this is the number of directed Hamiltonian paths on the n-prism graph. A124350

Numbers k such that φ(τ(k)) = sopf(k). A173326