Properties of the Number -21339

Twenty-One Thousand Three Hundred Thirty-Nine

Basics

Value: -21340 → -21339 → -21338

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2371

Divisors: 1, 3, 9, 2371, 7113, 21339

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -101001101011011

Octal: -51533

Duodecimal: -10423

Hexadecimal: -535b

Square: 455352921

Square Root: 146.07874588727822

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) = ∑_k<=n A000203(k)*(n-k+1), where A000203(m) is the sum of divisors of m. A175254

Trajectory of 18 under iteration of the map k -> A087712(k). A77960

Number of partitions p of n such that the number of parts is not a part and max(p) - min(p) is not a part. A241385

a(n) = 729·n - 531. A156771

Bitwise encoding of the state of a 1D cellular automaton after n steps from ...111000... where adjacent cells swap 01 <-> 10 when within triples 110 or 011. A359303

Number of 4-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal. A209345

Partial sums of A256970. A256971

Isomers of polyenes attached to benzene (see Cyvin et al. for precise definition). A121097

a(n) = f(n,n) where f(0,n) = f(n,0) = n! and f(m,n) = f(m-1,n) + f(m,n-1) + f(m-1,n-1). A346374