Properties of the Number 21622

Twenty-One Thousand Six Hundred Twenty-Two

Basics

Value: 21621 → 21622 → 21623

Parity: even

Prime: No

Previous Prime: 21617

Next Prime: 21647

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 19 × 569

Divisors: 1, 2, 19, 38, 569, 1138, 10811, 21622

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010001110110

Octal: 52166

Duodecimal: 1061A

Hexadecimal: 5476

Square: 467510884

Square Root: 147.04421103872127

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

Partial sums of A219661. A226061

a(n) = (n + 1)*(20·n² + 19·n + 6)/6. A220084

Numbers k(n) used for Markoff forms determining quadratic irrationals with purely periodic continued fractions. A305311

Triangle of coefficients of polynomials v(n,x) jointly generated with A209141; see the Formula section. A209142

Triangle of coefficients of polynomials v(n,x) jointly generated with A209745; see the Formula section. A209746

Number of (w,x,y) with all terms in {0,...,n} and w<=x+y and x<=y. A212983

G.f. A(x) satisfies: A(x) = 1 / (1 - x + x³ * A(x)). A349047

Number of (n+1)X(n+1) -9..9 symmetric matrices with every 2X2 subblock having sum zero and two or three distinct values. A211552

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 1, 1), (0, 0, 1), (1, 0, 0), (1, 1, -1)}. A150156

Number of Honaker primes (A033548) less than 10ⁿ. A151993