Properties of the Number 21796

Twenty-One Thousand Seven Hundred Ninety-Six

Basics

Value: 21795 → 21796 → 21797

Parity: even

Prime: No

Previous Prime: 21787

Next Prime: 21799

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5449

Divisors: 1, 2, 4, 5449, 10898, 21796

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010100100100

Octal: 52444

Duodecimal: 10744

Hexadecimal: 5524

Square: 475065616

Square Root: 147.63468427168462

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

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones. A31864

a(n) = a(n-1) + R(a(n-2)) + R(a(n-3)) + R(a(n-4)) where a(1) = a(2) = a(3) = a(4) = 1 and R(n) (A004086) is the reverse of n. A74865

Row sums of Bell related number triangle A154380. A154381

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 670", based on the 5-celled von Neumann neighborhood. A273394

Records in A390108. A390454

A new general triangle sequence based on the Eulerian form in three parts ( subtraction):m=2; t0(n,k)=If[n·k == 0, 1, Sum[(-1)^j Binomial[n + 1, j](k + 1 - j)ⁿ, {j, 0, k + 1}]] t(n,k,m)=If[n == 0, 1, ( m*(n - k) + 1)*t0(n - 1 + 1, k - 1) + (m·k + 1)*t0(n - 1 + 1, k) - m·k*(n - k)*t0(n - 2 + 1, k - 1)]. A157180

Decimal expansion of 1/792. A21796