211530165 has 64 divisors (see below), whose sum is σ = 423954432. Its totient is φ = 87494400.

The previous prime is 211530157. The next prime is 211530169. The reversal of 211530165 is 561035112.

It is not a de Polignac number, because 211530165 - 2³ = 211530157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211530169) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 430570 + ... + 431060.

It is an arithmetic number, because the mean of its divisors is an integer number (6624288).

Almost surely, 2^211530165 is an apocalyptic number.

It is an amenable number.

211530165 is an abundant number, since it is smaller than the sum of its proper divisors (212424267).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211530165 is a wasteful number, since it uses less digits than its factorization.

211530165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 211530165 is about 14544.0766293361. The cubic root of 211530165 is about 595.8323825219.

Adding to 211530165 its reverse (561035112), we get a palindrome (772565277).

The spelling of 211530165 in words is "two hundred eleven million, five hundred thirty thousand, one hundred sixty-five".