Properties of the Number 21104

Twenty-One Thousand One Hundred Four

Basics

Value: 21103 → 21104 → 21105

Parity: even

Prime: No

Previous Prime: 21101

Next Prime: 21107

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 ⁴ × 1319

Divisors: 1, 2, 4, 8, 16, 1319, 2638, 5276, 10552, 21104

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001001110000

Octal: 51160

Duodecimal: 10268

Hexadecimal: 5270

Square: 445378816

Square Root: 145.27215837867902

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 Costas arrays of order n, counting rotations and flips as distinct. A8404

E.g.f.: ∏_k>0 (1 + tanh(x^k/k)). A270598

Determinants of 5 X 5 matrices consisting of 25 consecutive primes. A118815

Expansion of e.g.f. (1 + x + x²)^x. A191422

Numbers equal to the arithmetic derivative of their Euler totient function. A248815

Interprimes which are of the form s·prime, s=16. A75291

Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique. A170813

Number of permutations of 1..n with all differences of elements separated by distances 1 through 8 being respectively unique. A170814

Number of permutations of 1..n with all differences of elements separated by distances 1 through 9 being respectively unique. A170815

Irregular triangular array read by rows. T(n,k) is the number of weakly connected relations on n labeled nodes with k arcs. (n>=0, 0<=k<=n²). A217563