Properties of the Number 21246

Twenty-One Thousand Two Hundred Forty-Six

Basics

Value: 21245 → 21246 → 21247

Parity: even

Prime: No

Previous Prime: 21227

Next Prime: 21247

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 3541

Divisors: 1, 2, 3, 6, 3541, 7082, 10623, 21246

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001011111110

Octal: 51376

Duodecimal: 10366

Hexadecimal: 52fe

Square: 451392516

Square Root: 145.7600768386186

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 m such that A166133(m+1) = A166133(m)² - 1. A256703

Numbers n such that A002088(n) < 3n²/π². A285022

Consecutive states of the linear congruential pseudo-random number generator (625·s + 6571) mod 31104 when started at s=1. A385279

Number of n-length words w over a 4-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_i-1) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z. A240610

Values of n such that n^a-+a are primes, a=7. A155022

Number of (5+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. A250659

Nonprime numbers k whose arithmetic derivative k' (A003415) is a Fibonacci number (A000045). A362141

Expansion of (η(q³)η(q¹⁵)/(η(q)η(q⁵)))² in powers of q. A93065

a(n) = (n+1)(n+2)(n+3)(35n³ + 153n² + 232n + 120)/720. A107971

Numbers of graphs which are double triangle descendants of K₅ with four more vertices than triangles. A332735