Properties of the Number 21130

Twenty-One Thousand One Hundred Thirty

Basics

Value: 21129 → 21130 → 21131

Parity: even

Prime: No

Previous Prime: 21121

Next Prime: 21139

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 2113

Divisors: 1, 2, 5, 10, 2113, 4226, 10565, 21130

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010001010

Octal: 51212

Duodecimal: 1028A

Hexadecimal: 528a

Square: 446476900

Square Root: 145.3616180427282

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

Starts of runs of 3 consecutive factorial base Niven numbers (A118363). A328206

Starts of runs of 3 consecutive lazy-tribonacci-Niven numbers (A352107). A352109

G.f.: A(x) = ( G(x)⁵ - G(x⁵) - 5·x*((1-x⁴)/(1-x))/(1-x⁵) )/(25·x²) where G(x) is the g.f. of A110631. A111583

Let s(k) be the sum of the decimal digits of a number k. a(n) is the smallest k such that s(k)*(s(k)+n)=k, or 0 if no such k exists. A190216

Decimal expansion of 1/126. A21130