Properties of the Number 21080

Twenty-One Thousand Eighty

Basics

Value: 21079 → 21080 → 21081

Parity: even

Prime: No

Previous Prime: 21067

Next Prime: 21089

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 5 × 17 × 31

Divisors: 1, 2, 4, 5, 8, 10, 17, 20, 31, 34

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001011000

Octal: 51130

Duodecimal: 10248

Hexadecimal: 5258

Square: 444366400

Square Root: 145.1895313030523

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

In the interior of a regular 2n-gon with all diagonals drawn, the number of points where exactly three diagonals intersect. A101363

Smith numbers of order 3. A178213

a(n) = n*(n + 11)*(n + 22)/6. A264445

Antidiagonal sums of table A125860. A125859

Coordination sequence for Cr3Si, Si position. A9927

Antidiagonal sums of the convolution array A213849. A213850

Number of non-isomorphic phylogenetic trees with n nodes. A330627

Coefficients of polynomials S(n,x) related to Springer numbers. A98432

The fourth row of the ED2 array A167560. A167561

Numbers n such that 1n1, 3n3, 7n7 and 9n9 are all primes. A59677