Properties of the Number 21849

Twenty-One Thousand Eight Hundred Forty-Nine

Basics

Value: 21848 → 21849 → 21850

Parity: odd

Prime: No

Previous Prime: 21841

Next Prime: 21851

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7283

Divisors: 1, 3, 7283, 21849

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101010101011001

Octal: 52531

Duodecimal: 10789

Hexadecimal: 5559

Square: 477378801

Square Root: 147.81407240178453

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

a(n) = (4ⁿ + 11)/3. A163868

Coefficients in the power series A(x) such that: A(x)⁴ = ∑_n=-oo..+oo xⁿ * (1 - xⁿ⁺¹)ⁿ⁺¹ * A(x)ⁿ. A357204

a(0) = 3, a(1) = 5, a(2) = 1, and a(n) = (2^{1 + n} - 11*(-1)ⁿ)/3 for n > 2. A115335

Total number of ON cells in the "Ulam-Warburton" two-dimensional cellular automaton of A147562 after A048645(n) generations. A255264

Right edge of triangle A297497. A297498

Smallest m such that A065623(m) = n. A65624

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones. A31858

a(1) = 3; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0. A25000

a(n) + a(n+1) = 2ⁿ for n >= 0 with a(0) = 4. A352692

Triangle T(n,k) (n>=0, 0<=k<=n) read by rows: use T(n,k)=T(n,k-1)+T(n-1,k-1) rule except left edge is the sequence read by rows, initial values are T(0,0)=0, T(1,0)=1. A297497