Properties of the Number 21716

Twenty-One Thousand Seven Hundred Sixteen

Basics

Value: 21715 → 21716 → 21717

Parity: even

Prime: No

Previous Prime: 21713

Next Prime: 21727

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 61 × 89

Divisors: 1, 2, 4, 61, 89, 122, 178, 244, 356, 5429

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010011010100

Octal: 52324

Duodecimal: 10698

Hexadecimal: 54d4

Square: 471584656

Square Root: 147.36349615830918

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

Powers of cube root of 20 rounded up. A18035

Number of partitions p of n such that median(p) >= mean(p). A240221

Let p = n-th irregular prime, A000928(n). Then a(n) = smallest value of m such that numerator(Bernoulli(2·m)/(2·m)) / numerator(Bernoulli(2·m)/(2·m*(2·m-1))) equals p. A92291

Numbers k such that 6·p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)*p(k+6)-1 and 6·p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*p(k+5)*p(k+6)+1 are twin primes with p(h) = h-th prime. A129313

Number of nX3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 0 1 vertically. A207264

Numbers k such that A008475(k)+1 = A008475(k+1). A333801

Numbers k such that A181894(k)+1 = A181894(k+1). A333802

a(n+1) = a(n) converted to base 6 from base 5 (written in base 10). A23379

Numbers k such that sopf(k) = sopfr(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k). A64678

Indices of primes in sequence defined by A(0) = 17, A(n) = 10·A(n-1) - 63 for n > 0. A102007