211

Number
$211$ (two hundred and eleven) is:


 * The $47$th prime number


 * The $41$st lucky number:
 * $1, 3, 7, 9, 13, 15, 21, \ldots, 163, 169, 171, 189, 193, 195, 201, 205, 211, \ldots$


 * The $5$th prime number after $5, 53, 157, 173$ which is the arithmetic mean of the prime numbers on either side of it:
 * $211 = \dfrac 199 + 223} 2$


 * The $11$th of $11$ primes of the form $2 x^2 + 11$:
 * $2 \times 10^2 + 11 = 211$