Properties of the Number 21406

Twenty-One Thousand Four Hundred Six

Basics

Value: 21405 → 21406 → 21407

Parity: even

Prime: No

Previous Prime: 21401

Next Prime: 21407

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 7 × 11 × 139

Divisors: 1, 2, 7, 11, 14, 22, 77, 139, 154, 278

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001110011110

Octal: 51636

Duodecimal: 1047A

Hexadecimal: 539e

Square: 458216836

Square Root: 146.30789452384312

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

Series for first parallel moment of square lattice. A6728

Triangle read by rows: T(n,k) (n,k>=0) = number of peakless Motzkin paths of length n having k valleys (i.e., (1,-1) followed by (1,1)) at level zero (can be easily translated into RNA secondary structure terminology). A110333

Numbers k such that the k-th triangular number contains only digits {1,2,9}. A119110

Number of ways to get ten-pin bowling score of 300-n. A79596

Number of peakless Motzkin paths of length n having no valleys (i.e., (1,-1) followed by (1,1)) at level zero (can be easily translated into RNA secondary structure terminology). A110334

Decimal expansion of 1/402. A21406