Properties of the Number 21082

Twenty-One Thousand Eighty-Two

Basics

Value: 21081 → 21082 → 21083

Parity: even

Prime: No

Previous Prime: 21067

Next Prime: 21089

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 83 × 127

Divisors: 1, 2, 83, 127, 166, 254, 10541, 21082

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001001011010

Octal: 51132

Duodecimal: 1024A

Hexadecimal: 525a

Square: 444450724

Square Root: 145.19641868861643

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 twice-partitions of n with no repeated partitions. A296122

Numbers whose square starts with 4 identical digits. A132391

Numbers that appear exactly five times in A101402. (Also indices of fives in A101403.). A129117

Sum of the asymmetry degrees of all compositions of n with parts in {1,2}. A275439

Expansion of ∏_{k >= 1} 1/(1-x^k)^c(k), where c(1), c(2), ... = 2 3 2 3 2 3 2 3 .... A29863

Number of basis partitions of n+36 with Durfee square size 6. A53801

Number of sets of exactly ten nonempty words with a total of n letters over n-ary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter. A293972

Numbers whose square starts with exactly 4 identical digits. A346940

Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1. A368702

a(n) = ∑_k=0..n (k+1) * A026725(n, k). A27211