Properties of the Number 21317

Twenty-One Thousand Three Hundred Seventeen

Basics

Value: 21316 → 21317 → 21318

Parity: odd

Prime: Yes

Previous Prime: 21313

Next Prime: 21319

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 21317

Divisors: 1, 21317

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001101000101

Octal: 51505

Duodecimal: 10405

Hexadecimal: 5345

Square: 454414489

Square Root: 146.00342461736986

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

Primes of the form k² + 1. A2496

Primes p such that continued fraction of (1 + sqrt(p))/2 has period 3. A146348

Primes of the form 4·k² + 1. A121326

Primes p such that the number of distinct prime divisors of all composite numbers between p and the next prime is 5. A75585

Growth series for affine Coxeter group (or affine Weyl group) D₄. A266759

Primes of form 4·p² + 1, p prime. A52292

Odd powers of primes of the form q = x² + 1 (A002496). A54755

Divisorial primes: primes p of the form p = 1 + ∏_d∣k d for some k. A258455

Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295013

Convolution of A000108 (Catalan) with A000351 (powers of 5). A46714