Properties of the Number 21079

Twenty-One Thousand Seventy-Nine

Basics

Value: 21078 → 21079 → 21080

Parity: odd

Prime: No

Previous Prime: 21067

Next Prime: 21089

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 107 × 197

Divisors: 1, 107, 197, 21079

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001001010111

Octal: 51127

Duodecimal: 10247

Hexadecimal: 5257

Square: 444324241

Square Root: 145.18608748774795

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

Positive integers of the form (7·m²+1)/11. A179370

Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not. A336561

a(n) = Sum {k + j·m <= n} (k + j·m), with 0 < k,j,m <= n. A106847

Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= six. A287256

a(1) = 1; thereafter a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that any five consecutive digits in the sequence sum up to a prime. A152605

Numbers k such that A353802(k) / σ(σ(k)) is an integer > 1, where A353802(n) = ∏_p^e||n σ(σ(p^e)). A353807

Imbalance of the sum of largest parts of all partitions of n. A194809

When squared gives number composed just of the digits 1, 2, 3, 4. A61677

G.f.: exp( ∑_n>=1 (2ⁿ + (-1)ⁿ)ⁿ * xⁿ/n ). A211897

Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors. A131523