Properties of the Number 21046

Twenty-One Thousand Forty-Six

Basics

Value: 21045 → 21046 → 21047

Parity: even

Prime: No

Previous Prime: 21031

Next Prime: 21059

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 17 × 619

Divisors: 1, 2, 17, 34, 619, 1238, 10523, 21046

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001000110110

Octal: 51066

Duodecimal: 1021A

Hexadecimal: 5236

Square: 442934116

Square Root: 145.07239572020586

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

a(n) = (n-1)*(n-2)³ - A003878(n-3), with a(1) = a(2) = 0 and a(3) = 2. A75681

a(n) = ∑_{m=0..floor((n-1)/2)} prime((n-m)(n-m-1)/2+m+1). A249490

G.f. A(x) satisfies: A(x) = x - x² * exp(A(x) + A(x²)/2 + A(x³)/3 + A(x⁴)/4 + ...). A363062

Fractal palindromic primes of first order. A82584

Decimal expansion of 1/42. A21046

Decimal expansion of the solution to the Heilbronn triangle problem for seven points in a unit square. A343851

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8. A252046

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 4 6 or 7. A252098