Properties of the Number 21210

Twenty-One Thousand Two Hundred Ten

Basics

Value: 21209 → 21210 → 21211

Parity: even

Prime: No

Previous Prime: 21193

Next Prime: 21211

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 5 × 7 × 101

Divisors: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001011011010

Octal: 51332

Duodecimal: 10336

Hexadecimal: 52da

Square: 449864100

Square Root: 145.6365338780074

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 integer partitions of n > 0 that are not the first sums of any composition with all parts > 1. A391620

Number of digits in the decimal expansion of the number of partitions of 6ⁿ. A248733

a(n) = sum of all divisors of all numbers k such that n² <= k < (n+1)². A168012

Numbers with exactly 5 distinct prime factors each of which is a palindrome. A46403

A variant of the recurrence for A001190. A38751

Factorial expansions of the entries in A085219. A85221

Numbers n which are a proper multiple (>1) of A068505(n) (= n read in base m+1 where m = largest digit of n). A89584

Indices of consecutive maxima in A214123. A214124

A Chebyshev transform of the first kind of the Catalan numbers. A102880

Number of (n+3) X 7 binary arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock. A188100