Properties of the Number 21184

Twenty-One Thousand One Hundred Eighty-Four

Basics

Value: 21183 → 21184 → 21185

Parity: even

Prime: No

Previous Prime: 21179

Next Prime: 21187

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ⁶ × 331

Divisors: 1, 2, 4, 8, 16, 32, 64, 331, 662, 1324

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001011000000

Octal: 51300

Duodecimal: 10314

Hexadecimal: 52c0

Square: 448761856

Square Root: 145.54724318928203

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

Sum of the parts in the partitions of 4n into 4 parts with smallest part = 1. A239056

Expansion of e.g.f.: -LambertW(-x) / LambertW(x). A215882

Smallest k > 0 with gcd(k, rev(k)) = n, where rev(k) is digit reversal of k and with sum of digits of k = n, or 0 if no such k exists. A333666

Numbers k such that (k / product of digits of k) is 1 or a prime. A1103

Partial sums of A034953(n). A85739

Row sums of triangle A115237. A115238

Number of solutions to n = ∑_i=1..π(n-1) c(i)*p(i) with c(i) in {-1,0,1}, p(n) = n-th prime and π = A000720. A215222

Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits. A241846

p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = 1 - S² - S³. A291736

Array read by antidiagonals: T(n,k) is the determinant of the Hankel matrix of the 2·n-1 consecutive primes starting at the k-th prime, n >= 0, k >= 1. A350200