Properties of the Number 13221

Thirteen Thousand Two Hundred Twenty-One

Basics

Value: 13220 → 13221 → 13222

Parity: odd

Prime: No

Previous Prime: 13219

Next Prime: 13229

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 13 × 113

Divisors: 1, 3, 9, 13, 39, 113, 117, 339, 1017, 1469

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001110100101

Octal: 31645

Duodecimal: 7799

Hexadecimal: 33a5

Square: 174794841

Square Root: 114.9826073804208

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

Factorial expansion of A071156. A71158

a(n) = (4·n+1)*(4·n+5). A3185

Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences. A316713

Let R(i,j) be the rectangle with antidiagonals 1; 2,3; 4,5,6; ...; the n-th Lucas number is in antidiagonal a(n). A57045

Number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 3", based on the 5-celled von Neumann neighborhood. A269910

a(n) = ∑_{k=0..floor(n/4)} binomial(n-3·k,k) * binomial(2*(n-4·k),n-4·k). A383582

Nearest integer to γ(n + 7/11)/γ(7/11). A20008

Ceiling of γ(n+7/11)/γ(7/11). A20098

Ado [Simone Caramel]'s function: a(0) = 1, a(n) = a(n-1) + 2*(Fibonacci(n+1)-n), n > 0. A64551

Adjacent generalized Fermat primes. A118539