Properties of the Number 21882

Twenty-One Thousand Eight Hundred Eighty-Two

Basics

Value: 21881 → 21882 → 21883

Parity: even

Prime: No

Previous Prime: 21881

Next Prime: 21893

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 7 × 521

Divisors: 1, 2, 3, 6, 7, 14, 21, 42, 521, 1042

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101010101111010

Octal: 52572

Duodecimal: 107B6

Hexadecimal: 557a

Square: 478821924

Square Root: 147.92565700378012

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

Numbers n such that Bernoulli number B_n has denominator 1806. A272139

Number of ways of writing n as the sum of 7 triangular numbers. A226252

Expansion of e.g.f. 1/(1 - x² * exp(x)). A358080

T(n,k)=Number of nXk 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. A279268

Sum of number of divisors of x^y for each x >= 1, y >= 0, x + y = n. A343657

Integers·such that for some integer y we have uphi(x) = uphi(y) = x-y, where uphi(n) = A047994(n) is the unitary totient function: If n = Product p_i^e_i, uphi(n) = Product (p_i^e_i - 1). A67739

Number of Aut(G)-orbits on G-characters that come from Riemann surfaces of genus n. A347373

Expansion of e.g.f. A(x) satisfying A(x) = x + A( x²*exp(x) ), with A(0) = 0. A369091

Numbers k such that 39·2^k + 1 is prime. A2269

Number of permutations of length n whose powers all avoid the pattern 132. A326762