Properties of the Number 12216

Twelve Thousand Two Hundred Sixteen

Basics

Value: 12215 → 12216 → 12217

Parity: even

Prime: No

Previous Prime: 12211

Next Prime: 12227

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 509

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 509, 1018

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111110111000

Octal: 27670

Duodecimal: 70A0

Hexadecimal: 2fb8

Square: 149230656

Square Root: 110.52601503718479

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 ways to write n as an ordered sum of 8 primes. A340964

a(n) = ∑_k=0..n (-1)^n-k * binomial(n,k) * binomial(5·k,k) / (4·k + 1). A346665

a(1) = 1; thereafter a(n) is the smallest number > a(n-1) such that a(n) minus any sum of distinct earlier terms is not already in the sequence. A66425

Partial sums of A080670. A287881

a(n) = ((6 + sqrt(2))ⁿ + (6 - sqrt(2))ⁿ)/2. A147957

Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 5. A209990

a(n) is the smallest k such that in the interval [1,k] of sequence A242034 all odd primes <= prime(n) are present. A242037

McKay-Thompson series of class 21A for Monster. A58563

Antidiagonal sums of triangle A124428. A124429

Numbers k such that (k / product of digits of k) is 1 or a prime. A1103