Properties of the Number 21106

Twenty-One Thousand One Hundred Six

Basics

Value: 21105 → 21106 → 21107

Parity: even

Prime: No

Previous Prime: 21101

Next Prime: 21107

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 × 61 × 173

Divisors: 1, 2, 61, 122, 173, 346, 10553, 21106

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001110010

Octal: 51162

Duodecimal: 1026A

Hexadecimal: 5272

Square: 445463236

Square Root: 145.27904184706065

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

G.f. A(x) satisfies A(x) = 1/(1 - x/(1 - x·A(x))⁴). A321798

a(n) = ∑_k=1..n floor(n³/k³). A344675

Number of partitions of 2·n into minimal numbers. A99385

Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1. A368702

Numbers k such that the continued fraction for sqrt(k) has period 65. A20404

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 32. A31620

T(n,k) = 1/16 the number of (n+1) X (k+1) 0..3 arrays with all 2 X 2 subblocks having the same four values. A184039

Expansion of ( 5-9·x²-2·x³ ) / ( (1+x-x²)*(1-x-x²-x³) ). A190914

Decimal expansion of 1/102. A21106

Number of (n+2)X(4+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 4. A252061