Properties of the Number 21110

Twenty-One Thousand One Hundred Ten

Basics

Value: 21109 → 21110 → 21111

Parity: even

Prime: No

Previous Prime: 21107

Next Prime: 21121

Digit Sum: 5

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 2111

Divisors: 1, 2, 5, 10, 2111, 4222, 10555, 21110

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001110110

Octal: 51166

Duodecimal: 10272

Hexadecimal: 5276

Square: 445632100

Square Root: 145.29280780547947

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

Triangle of partial sums of Stirling numbers of 2nd kind (A008277): T(n,k) = ∑_i=1..k Stirling2(n,i), 1<=k<=n. A102661

a(n) = (1/5040)*7ⁿ + (1/240)*5ⁿ + (1/72)*4ⁿ + (1/16)*3ⁿ + (11/60)*2ⁿ + 53/144. Partial sum of Stirling numbers of second kind S(n,i), i=1..7 (i.e., a(n) = ∑_i=1..7 S(n,i)). A99262

T(n,k)=Number of nXk 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order. A209465

Numbers of rank 11 in the poset of lunar numbers. A191753

Total number of parts coprime to n in the partitions of n into 7 parts. A363325

Ternary numbers that are concatenated runs C(1)A(1)B(1)C(2)A(2)B(2)...C(k)A(k)B(k), where A(i) is a run of 1's, B(i) a run of 0's, and C(i) a run of 2's, for i = 1..k. A371111

Each permutation in the list A060117 converted to Site Swap notation, with digits reversed. "Zero throws" (fixed elements) indicated with 0's. A60496

List of binary words of lengths 0, 1, 2, etc., including empty word, each prefixed by a 2. A319953

Factorial expansions of the entries in A085219. A85221

Factorial expansions of the entries in A085220. A85222