Properties of the Number 21047

Twenty-One Thousand Forty-Seven

Basics

Value: 21046 → 21047 → 21048

Parity: odd

Prime: No

Previous Prime: 21031

Next Prime: 21059

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 13 × 1619

Divisors: 1, 13, 1619, 21047

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001000110111

Octal: 51067

Duodecimal: 1021B

Hexadecimal: 5237

Square: 442976209

Square Root: 145.0758422343293

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

Number of paraffins C_n H_2n-1 X₃ with n carbon atoms. A641

a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 3, where m = 2·n - 3 - 2^p+1 and p is the unique integer such that 2^p < n-1 <= 2^p+1, with a(1) = a(2) = 1. A49884

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 0, -1), (0, 1, 1), (1, 0, 0)}. A150195

Decimal expansion of 1/43. A21047