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Properties of the Number 21854

Twenty-One Thousand Eight Hundred Fifty-Four

Basics

Value: 21853 → 21854 → 21855

Parity: even

Prime: No

Previous Prime: 21851

Next Prime: 21859

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 7 2 × 223

Divisors: 1, 2, 7, 14, 49, 98, 223, 446, 1561, 3122

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010101011110

Octal: 52536

Duodecimal: 10792

Hexadecimal: 555e

Square: 477597316

Square Root: 147.83098457360012

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

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 or 1 and no column sum 0 or 1. A255027
Triangle T(n,k), n >= 1, giving number of prime unoriented alternating links with n crossings and k components. A59739
Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 185", based on the 5-celled von Neumann neighborhood. A279700
Floor-Sqrt transform of Catalan numbers (A000108). A186546
a(n) = (n4 + 2·n3 - n2)/2. A255499
First row of spectral array W(γ2+1). A250254
Total number of partitions of all hypercubes resulting from a sequence of n bisections, each of which splits any part perpendicular to any of the axes, such that each dimension is used at least once. A258425
Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes or outdegrees larger than seven. A292213
Number of rooted trees with n nodes and 5 leaves. A55280
Prime unoriented alternating links with n crossings and 2 components. A59741