Properties of the Number 21956

Twenty-One Thousand Nine Hundred Fifty-Six

Basics

Value: 21955 → 21956 → 21957

Parity: even

Prime: No

Previous Prime: 21943

Next Prime: 21961

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 11 × 499

Divisors: 1, 2, 4, 11, 22, 44, 499, 998, 1996, 5489

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010111000100

Octal: 52704

Duodecimal: 10858

Hexadecimal: 55c4

Square: 482065936

Square Root: 148.17557153593165

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

Eight white kings and one red king on a 3 X 3 chessboard. G.f.: (1 + x)/(1 - 3·x - 5·x²). A179606

Numbers that are the sum of seven fourth powers in seven or more ways. A345573

Numbers that are the sum of seven fourth powers in exactly seven ways. A345829

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 459", based on the 5-celled von Neumann neighborhood. A282365

Members of 3-cycles of permutation A111273. A113701

Antidiagonal sums of table A096751. A96753

Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w³>x³+y³. A211811

a(n) = n³ + 4. A274077

Expansion of (1-x)^-1/(1+x-x²-2·x³). A77901

a(n) = 36·Fibonacci(2·n+1) - 4. A153981