Properties of the Number 21671

Twenty-One Thousand Six Hundred Seventy-One

Basics

Value: 21670 → 21671 → 21672

Parity: odd

Prime: No

Previous Prime: 21661

Next Prime: 21673

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 13 × 1667

Divisors: 1, 13, 1667, 21671

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010010100111

Octal: 52247

Duodecimal: 1065B

Hexadecimal: 54a7

Square: 469632241

Square Root: 147.21073330433484

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

G.f. is the cube of the g.f. of A006950. A273226

a(n) = greatest k such that A155043(k+A262509(n)) < A155043(A262509(n)). A262909

The point at which the powers of n merge on an 8-digit calculator. A216069

Number of partitions p of n such that (number of numbers in p of form 3k) > (number of numbers in p of form 3k+1). A241745

Numbers k such that both k and k+2 are de Polignac numbers (A006285). A330284

Take list of cubes, move left digit of each term to end of previous term. A32761

Number of (n+4) X 11 0..1 matrices with each 5 X 5 subblock idempotent. A224689

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 419", based on the 5-celled von Neumann neighborhood. A272047

Numbers n such that 141·2ⁿ-1 is prime. A50596

Numbers n such that σ(σ(n) - φ(n)) = φ(σ(n) + φ(n)). A74876