Properties of the Number 21626

Twenty-One Thousand Six Hundred Twenty-Six

Basics

Value: 21625 → 21626 → 21627

Parity: even

Prime: No

Previous Prime: 21617

Next Prime: 21647

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 11 × 983

Divisors: 1, 2, 11, 22, 983, 1966, 10813, 21626

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010001111010

Octal: 52172

Duodecimal: 10622

Hexadecimal: 547a

Square: 467683876

Square Root: 147.0578117612254

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

T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences. A200553

Numbers k such that k¹⁴ == 1 (mod 15³). A56087

a(n) = A078223(n+1)/A078223(n). A78224

Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not. A336561

Third column of A071223. A87645

G.f. A(x) satisfies: x = ∑_n>=1 ((1+x)ⁿ - 1)ⁿ / A(x)ⁿ. A303654

Number of strictly increasing arrangements of 5 nonzero numbers in -(n+3)..(n+3) with sum zero. A188124

Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences. A200547

Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second differences. A200558

a(n) = n + (n-1)*(n-2) + (n-3)*(n-4)*(n-5) + (n-6)*(n-7)*(n-8)*(n-9) + ... + ...*1. A239519