Properties of the Number 21168

Twenty-One Thousand One Hundred Sixty-Eight

Basics

Value: 21167 → 21168 → 21169

Parity: even

Prime: No

Previous Prime: 21163

Next Prime: 21169

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ³ × 7 ²

Divisors: 1, 2, 3, 4, 6, 7, 8, 9, 12, 14

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001010110000

Octal: 51260

Duodecimal: 10300

Hexadecimal: 52b0

Square: 448084224

Square Root: 145.4922678357857

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) = n³ - n². A45991

Number of partitions of 4n into 4 parts. A238340

Amicable triples: numbers such that σ(x) = σ(y) = σ(z) = x+y+z, x<y<z. We order these triples according to the common value of σ. Sequence gives·numbers. A125490

a(n) = 12·n². A135453

Stirling2 triangle with scaled diagonals (powers of 2). A75497

a(n) = ∏_k>=0 (1 + floor(n/2^k)). A132269

T(n,k)=Number of length n+3 0..k arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms. A250387

Least number with exactly n prime factors counted with multiplicity which gives a different number with exactly n prime factors counted with multiplicity when digits are reversed. A109018

a(n) is the concatenation of n and 8n. A9470

Numbers that have exactly nine prime factors counted with multiplicity (A046312) whose digit reversal is different and also has 9 prime factors (with multiplicity). A109029