Properties of the Number 21994

Twenty-One Thousand Nine Hundred Ninety-Four

Basics

Value: 21993 → 21994 → 21995

Parity: even

Prime: No

Previous Prime: 21991

Next Prime: 21997

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 7 × 1571

Divisors: 1, 2, 7, 14, 1571, 3142, 10997, 21994

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010111101010

Octal: 52752

Duodecimal: 1088A

Hexadecimal: 55ea

Square: 483736036

Square Root: 148.3037423668061

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

Inverse Euler transform of the Riordan numbers, (A005043). A358451

Number of unlabeled Hamiltonian circuits on n-octahedron (cross polytope); also number of circular chord diagrams with n chords, modulo symmetries. A3437

Rounded volume of a regular octahedron with edge length n. A71400

Expansion of g.f. A(x) satisfying A(x) = 1 + x·A(x)² * (1 + A(x)³). A361638

Solutions y of the Mordell equation y² = x³ - 3a² - 1 for a = 0,1,2, ... (solutions·are given by A053755). A173200

Interprimes which are of the form s·prime, s=14. A75289

Expansion of A(x) satisfying [xⁿ] A(x) / (1 + x·A(x)ⁿ) = 0 for n > 0. A360582

Number of nX2 0..3 arrays with every repeated value in every row and column greater than the previous repeated value. A267929

G.f.: 1/((1-x)(1-4x)(1-10x)(1-12x)). A21994