Properties of the Number 21192

Twenty-One Thousand One Hundred Ninety-Two

Basics

Value: 21191 → 21192 → 21193

Parity: even

Prime: No

Previous Prime: 21191

Next Prime: 21193

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 883

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 883, 1766

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001011001000

Octal: 51310

Duodecimal: 10320

Hexadecimal: 52c8

Square: 449100864

Square Root: 145.57472308062276

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

Low-temperature susceptibility expansion for hexagonal lattice (Potts model, q=4). A57387

Triangle read by rows: T(n,k) (n >= 2, k >= 0) is the number of non-crossing connected graphs on n nodes on a circle, having k triangles. Rows are indexed 2,3,4,...; columns are indexed 0,1,2,.... A89435

Number of sequences of 2's and 3's of length n with curling number 3. A217212

Number of nX2 1..3 arrays containing at least one of each value, and all equal values connected. A166756

Upper Beatty array of sqrt(2). A182638

a(n) = ∑_{k=1..floor(n/2)} k * (n-k) * floor((n-k)/k). A339804

Non-1-tough simplicial polyhedra with n nodes. A342971

a(n) = ∑_d∣n n^φ(d). A345893

Index of first occurrence of 2n in A031883, or 0 if 2n never occurs in A031883 = first differences of lucky numbers A000959. A181558

Integers k such that there exist nonnegative integers x,y,z with k! = x³ + y³ + z³. A267414