Properties of the Number 21429

Twenty-One Thousand Four Hundred Twenty-Nine

Basics

Value: 21428 → 21429 → 21430

Parity: odd

Prime: No

Previous Prime: 21419

Next Prime: 21433

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2381

Divisors: 1, 3, 9, 2381, 7143, 21429

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001110110101

Octal: 51665

Duodecimal: 10499

Hexadecimal: 53b5

Square: 459202041

Square Root: 146.38647478507022

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) = A048141(3·n). A51061

a(n) = (1/3!)*(n³ + 24·n² + 107·n + 90), compare A059604. A59605

Trajectory of 3 under map n->7n+1 if n odd, n->n/2 if n even. A37101

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones. A31846

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 358", based on the 5-celled von Neumann neighborhood. A271412

The cell number where a knight is trapped when moving on a spirally numbered hexagonal board to the lowest available unvisited cell and starting at cell n. A333684

a(0)=7; a(n) = 7·a(n-1) + 1 if a(n-1) is odd, a(n) = a(n-1)/2 otherwise. A271623

Decimal expansion of shortest length of segment from side AB through centroid to side AC in right triangle ABC with sidelengths (a,b,c)=(3,4,5). A195304

Number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1),U=(1,2), or d=(1,-1) and having no pyramids (a pyramid is a sequence u^pd^p or U^pd^2p for some positive integer p, starting at the x-axis). A108449

Decimal expansion of 1/425. A21429