Properties of the Number 21291

Twenty-One Thousand Two Hundred Ninety-One

Basics

Value: 21290 → 21291 → 21292

Parity: odd

Prime: No

Previous Prime: 21283

Next Prime: 21313

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 47 × 151

Divisors: 1, 3, 47, 141, 151, 453, 7097, 21291

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100101011

Octal: 51453

Duodecimal: 103A3

Hexadecimal: 532b

Square: 453306681

Square Root: 145.9143584435747

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 lone-child-avoiding locally disjoint rooted identity trees whose leaves are integer partitions whose multiset union is an integer partition of n. A331686

Numbers n which are divisors of the number produced by concatenating (n-5), (n-4), ... (n-1) in that order. A88870

Expansion of ∏_k>=1 1/(1 - x^k)^sigma₁(k-k), where sigma₁(k) = sum of divisors of k (A000203). A318784

Number of unlabeled strongly connected n-state 2-input automata. A27835

Number of nX3 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4. A196133

Number of strings of numbers x(i=1..8) in 0..n with sum i²*x(i)³ equal to 64·n³. A184323

Decimal expansion of 1/287. A21291