Properties of the Number -211820

Two Hundred Eleven Thousand Eight Hundred Twenty

Basics

Value: -211821 → -211820 → -211819

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 7 × 17 × 89

Divisors: 1, 2, 4, 5, 7, 10, 14, 17, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110011101101101100

Octal: -635554

Duodecimal: -A26B8

Hexadecimal: -33b6c

Square: 44867712400

Square Root: 460.2390683112419

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

Triangle read by rows: T(n,k) = number of labeled acyclic digraphs with n nodes, containing exactly n+1-k points of in-degree zero (n >= 1, 1<=k<=n). A58876

Triangular array read by rows. T(n,k) is the number of labeled directed acyclic graphs on [n] with exactly k nodes of indegree 0. A361718

Number of n-node labeled acyclic digraphs with 3 out-points. A60335

a(n) = abs(a(n-1) - 3·a(n-2)) with a(1)=a(2)=1. A192263

Number of 4 X n 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically. A207950