Properties of the Number 21088

Twenty-One Thousand Eighty-Eight

Basics

Value: 21087 → 21088 → 21089

Parity: even

Prime: No

Previous Prime: 21067

Next Prime: 21089

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ⁵ × 659

Divisors: 1, 2, 4, 8, 16, 32, 659, 1318, 2636, 5272

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001100000

Octal: 51140

Duodecimal: 10254

Hexadecimal: 5260

Square: 444703744

Square Root: 145.21707888537077

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

Intrinsic 10-palindromes: n is an intrinsic k-palindrome if it is a k-digit palindrome in some base. A60947

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge. A251258

Numbers k such that k·2^m-1 are composites for all exponents m in the range 0<=m<=k. A61154

Expansion of ∏_k=1..16 theta₃(q^k), where theta₃() is the Jacobi θ function. A320247

Principal diagonal of the convolution array A213844. A213845

Expansion of ∏_m>=1 (1+m·q^m)^-16. A22708

Totients t such that the number of divisors of t equals the number of solutions of φ(x) = t. A305058

Sum of the first n safe primes. A66869

Number of -n..n arrays x(0..6) of 7 elements with zero sum and no two consecutive declines, no adjacent equal elements, and no element more than one greater than the previous (random base sawtooth pattern). A200185

σ(n)-n values in A085844. A216383