Properties of the Number 21041

Twenty-One Thousand Forty-One

Basics

Value: 21040 → 21041 → 21042

Parity: odd

Prime: No

Previous Prime: 21031

Next Prime: 21059

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 53 × 397

Divisors: 1, 53, 397, 21041

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001000110001

Octal: 51061

Duodecimal: 10215

Hexadecimal: 5231

Square: 442723681

Square Root: 145.0551619212498

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 integer compositions of n whose leaders of anti-runs are strictly decreasing. A374680

a(n) = 25·n² + 15·n + 1021. A214732

Number of maximal chains in the poset of all binary words of length <= n, ordered by B covers A iff A_i <= B_i+k for all i in A and some k >= 0. A378382

a(n) = n! * ∑_{k=0..floor(n/2)} (-k)^k / (k! * (n-2·k)!). A362337

Triangle read by rows: T(n,k) is the number of maximal chains in the poset of all k-ary words of length <= n, ordered by B covers A iff A_i <= B_i+k for all i in A and some k >= 0. A378588

Squares visited by a knight moving on a square-ringed numbered board where the knight moves to the smallest numbered unvisited square; the minimum distance from the origin is used if the square numbers are equal; the smallest spiral number ordering is used if the distances are equal. A328929

Number of (n+1) X (3+1) 0..3 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements. A251050

Decimal expansion of 1/37. A21041