Properties of the Number 16921

Sixteen Thousand Nine Hundred Twenty-One

Basics

Value: 16920 → 16921 → 16922

Parity: odd

Prime: Yes

Previous Prime: 16903

Next Prime: 16927

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 16921

Divisors: 1, 16921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100001000011001

Octal: 41031

Duodecimal: 9961

Hexadecimal: 4219

Square: 286320241

Square Root: 130.080744155313

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

Initial term in sequence of four consecutive primes whose consecutive differences have d-pattern = [6, 4, 6]; short d-string notation for pattern = [646]. A78856

Primes of form n² + 1296. A256834

Primes p such that (p+1)/2, (p+2)/3 and (p+3)/4 are also primes. A163573

Primes p such that (p+1)/2 and (p+2)/3 are also primes. A36570

Smallest odd prime factor of 3ⁿ + 1, for n > 1. A235365

Primes p such that A001175(p) = (p-1)/9. A308794

Irregular table read by rows: T(n,k) is the number of permutations in S_n that have exactly k occurrences of the pattern 2413. 0 <= k <= A342854(n). A342860

Numbers k such that τ(k) + τ(k+1) + τ(k+2) + τ(k+3) = 16, where τ is the number of divisors function A000005. A350686

Primes of the form x² + 1848·y². A139668

a(n) = ∑_{k = 0..n-1} binomial(n,k)²*binomial(n+k,k)*binomial(n+k-1,k). A361712