Properties of the Number -21659

Twenty-One Thousand Six Hundred Fifty-Nine

Basics

Value: -21660 → -21659 → -21658

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 11 ² × 179

Divisors: 1, 11, 121, 179, 1969, 21659

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101010010011011

Octal: -52233

Duodecimal: -1064B

Hexadecimal: -549b

Square: 469112281

Square Root: 147.16996976285617

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

Expansion of g.f. x / reversion(x - x² - x³). A217596

Indices of primes followed by a gap (distance to next larger prime) of 44. A320720

Triangle read by rows: T(n, k) = number of hill-free Dyck paths (i.e., no peaks at height 1) of semilength n and having k peaks. A100754

Number of 11-almost primes 11ap such that 2ⁿ < 11ap <= 2ⁿ⁺¹. A120042

Numbers k such that (2·k)!/(2*(k!)²) - 1 is prime. A112861

n for which floor((3/2)ⁿ) is prime. A70759

Fibonacci sequence beginning 8, 17. A22390

Fixed points of permutations A262323 and A262255. A262367

Growth function of an infinite cubic graph (number of nodes at distance <=n from fixed node). A38621

a(n) = 60·n² - 1. A158670