Properties of the Number -21741

Twenty-One Thousand Seven Hundred Forty-One

Basics

Value: -21742 → -21741 → -21740

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7247

Divisors: 1, 3, 7247, 21741

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

9108 Try Today's Challenge

Representations

Binary: -101010011101101

Octal: -52355

Duodecimal: -106B9

Hexadecimal: -54ed

Square: 472671081

Square Root: 147.44829602270758

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) = 2ⁿ⁺² + 3ⁿ + 10. A254365

E.g.f. A(x) satisfies A(x) = exp(x·C(x·A(x))²), where C(x) = 1 + x·C(x)² is the g.f. of A000108. A382032

Number of prime pairs below 10ⁿ having a difference of 30. A93750

Number of induced paths in the n-ladder graph P₂ X P_n. A360201

Total Wiener index of star-like trees with n edges. A186310

Number of (n+1)X(2+1) 0..1 arrays x(i,j) with row sums sum{j³*x(i,j), j=1..2+1} nondecreasing, and column sums sum{i³*x(i,j), i=1..n+1} nondecreasing. A232855

G.f. satisfies A(x) = A(x³)/(A(x²) - A(x³)), with A(0) = 0, A'(0) = 1. A382317

Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 98. A31596