Properties of the Number 21946

Twenty-One Thousand Nine Hundred Forty-Six

Basics

Value: 21945 → 21946 → 21947

Parity: even

Prime: No

Previous Prime: 21943

Next Prime: 21961

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 10973

Divisors: 1, 2, 10973, 21946

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010110111010

Octal: 52672

Duodecimal: 1084A

Hexadecimal: 55ba

Square: 481626916

Square Root: 148.14182393908885

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 rooted self-avoiding king's walks on an infinite chessboard trapped after n moves. A323562

Third row of Pascal-(1,4,1) array A081579. A81587

a(n) = 997·n + 1009. A100776

Numbers n such that 2·n + prime(n) is a square. A256246

Compound filter: a(n) = P(A055881(n), A278236(n)), where P(n,k) is sequence A000027 used as a pairing function. A286381

Compound filter: a(n) = P(A257993(n), A278226(n)), where P(n,k) is sequence A000027 used as a pairing function. A286382

Number of lattice paths from (0,0) to (n,n) that do not go below the x-axis or above the diagonal x=y and consist of steps u=(1,1), U=(1,2), d=(1,-1), D=(1,-2) and H=(1,0). A230662

Decimal expansion of 1/942. A21946