Properties of the Number 21297

Twenty-One Thousand Two Hundred Ninety-Seven

Basics

Value: 21296 → 21297 → 21298

Parity: odd

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 31 × 229

Divisors: 1, 3, 31, 93, 229, 687, 7099, 21297

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100110001

Octal: 51461

Duodecimal: 103A9

Hexadecimal: 5331

Square: 453562209

Square Root: 145.9349170006959

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) = 2·n³ + 1. A33562

T(n,k) = Number of (n+2) X (k+2) binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals. A202532

Product of n-th prime and the sum of the divisors of n. A272211

a(n) = 44·n² + 1. A158630

Write the primes in binary; a(n) = total number of 0's in those which have an n-bit expansion. A86904

Number of ways to arrange 2 nonattacking knights on the lower triangle of an n X n board. A194486

Number of (n+2) X 6 binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals. A202528

Number of (n+2) X 7 binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals. A202529

a(n) = 2·a(n-1) + a(n-3), where a(0) = 0, a(1) = 1, a(2) = 4. A335274

Enumeration of fractal 321 avoiders. A82631