Properties of the Number -21718

Twenty-One Thousand Seven Hundred Eighteen

Basics

Value: -21719 → -21718 → -21717

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 10859

Divisors: 1, 2, 10859, 21718

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

7925 Try Today's Challenge

Representations

Binary: -101010011010110

Octal: -52326

Duodecimal: -1069A

Hexadecimal: -54d6

Square: 471671524

Square Root: 147.37028194313805

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

a(n) = ∑_{k=0..floor(n/2)} (-1)^k * binomial(n-1-k,n-2·k) * binomial(2·k,k). A360313

Decimal part of cube root of n starts with 9: first term of runs. A34135

Irregular triangle read by rows: T(n,k) is the number of n X n tic-tac-toe positions (up to rotation and reflection) with k tokens (i.e., after k plays) which allow a winning strategy for O (n > 0, 0 <= k <= n²). A317574

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones. A31868

Number of self-avoiding walks on the truncated square tiling with n steps. A249565

Volume of Johnson square pyramid placed upright on cube (rounded down) with edge lengths equal to n. A227221