Properties of the Number -21158

Twenty-One Thousand One Hundred Fifty-Eight

Basics

Value: -21159 → -21158 → -21157

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 71 × 149

Divisors: 1, 2, 71, 142, 149, 298, 10579, 21158

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001010100110

Octal: -51246

Duodecimal: -102B2

Hexadecimal: -52a6

Square: 447660964

Square Root: 145.45789768864392

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

Number of subsets S of {1,2,...,n} which contain a number that is greater than the sum of the other numbers in S. A95944

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock differing from the number in all its horizontal and vertical neighbors. A205072

Irregular triangle read by rows: row n gives numbers of maximal chains of lengths n-1, n, n+1, ... in the Tamari lattice T_n. A282698

a(n) = (n - 2/3)*2ⁿ - n/2 + 3/4 - (-1)ⁿ/12. A127983

Numbers n such that σ(n) and σ(σ(n)) are both perfect squares. A134263

Number of (n+1) X 2 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock differing from the number in all its horizontal and vertical neighbors. A205065

Number of permutations of [n] avoiding {4231, 1243, 1234}. A294762

Greedy frac multiples of Catalan's constant, G: a(1)=1, ∑_n>0 frac(a(n)*x) = 1 at x=G=A006752, where "frac(y)" denotes the fractional part of y. A80158