211215165 has 16 divisors (see below), whose sum is σ = 386222208. Its totient is φ = 96555456.

The previous prime is 211215161. The next prime is 211215197. The reversal of 211215165 is 561512112.

It is not a de Polignac number, because 211215165 - 2² = 211215161 is a prime.

It is a super-2 number, since 2×211215165² = 89223691851954450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211215161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005682 + ... + 1005891.

It is an arithmetic number, because the mean of its divisors is an integer number (24138888).

Almost surely, 2^211215165 is an apocalyptic number.

It is an amenable number.

211215165 is a deficient number, since it is larger than the sum of its proper divisors (175007043).

211215165 is a wasteful number, since it uses less digits than its factorization.

211215165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011588.

The product of its digits is 600, while the sum is 24.

The square root of 211215165 is about 14533.2434439116. The cubic root of 211215165 is about 595.5364744617.

Adding to 211215165 its reverse (561512112), we get a palindrome (772727277).

The spelling of 211215165 in words is "two hundred eleven million, two hundred fifteen thousand, one hundred sixty-five".