Properties of the Number 21683

Twenty-One Thousand Six Hundred Eighty-Three

Basics

Value: 21682 → 21683 → 21684

Parity: odd

Prime: Yes

Previous Prime: 21673

Next Prime: 21701

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 21683

Divisors: 1, 21683

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010010110011

Octal: 52263

Duodecimal: 1066B

Hexadecimal: 54b3

Square: 470152489

Square Root: 147.25148556126692

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

Noncomposite numbers in the eastern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American. A168022

a(1) = 2; a(n) is the smallest prime > a(n-1) such that a(n) + a(n-1) is a square. A62064

Odd numbers m that are neither of the form p + 2^k nor of the form p - 2^k with 2^k < m, k >= 1, and p prime. A255967

K-bit primes p such that p-2ⁱ and p+2ⁱ are composite for 0<=i<=K-1. A153352

Prime numbers that are the sum of one or more consecutive triangular numbers. A269414

Primes that remain prime through 3 iterations of function f(x) = 3x + 4. A23278

Primes of the form ∑_k=1..m (m^k mod (m-k+1)). A156559

The set S of primes q satisfying certain conditions (see Müller, 2010 for precise definition). A275739

Primes that remain prime through 4 iterations of the function f(x) = 3x + 4. A23308

Numerators of continued fraction convergents to sqrt(603). A42156