211305 has 8 divisors (see below), whose sum is σ = 338112. Its totient is φ = 112688.

The previous prime is 211297. The next prime is 211313. The reversal of 211305 is 503112.

It is an interprime number because it is at equal distance from previous prime (211297) and next prime (211313).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211305 - 2³ = 211297 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7029 + ... + 7058.

It is an arithmetic number, because the mean of its divisors is an integer number (42264).

2²¹¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

211305 is a deficient number, since it is larger than the sum of its proper divisors (126807).

211305 is a wasteful number, since it uses less digits than its factorization.

211305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14095.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 211305 is about 459.6792359896. The cubic root of 211305 is about 59.5620894593.

Adding to 211305 its reverse (503112), we get a palindrome (714417).

It can be divided in two parts, 21 and 1305, that added together give a triangular number (1326 = T₅₁).

The spelling of 211305 in words is "two hundred eleven thousand, three hundred five".