165212213 has 16 divisors (see below), whose sum is σ = 172627200. Its totient is φ = 158019840.

The previous prime is 165212209. The next prime is 165212221. The reversal of 165212213 is 312212561.

165212213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165212213 - 2² = 165212209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165212263) 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, 383108 + ... + 383538.

It is an arithmetic number, because the mean of its divisors is an integer number (10789200).

Almost surely, 2^165212213 is an apocalyptic number.

It is an amenable number.

165212213 is a deficient number, since it is larger than the sum of its proper divisors (7414987).

165212213 is an equidigital number, since it uses as much as digits as its factorization.

165212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its digits is 720, while the sum is 23.

The square root of 165212213 is about 12853.4903041936. The cubic root of 165212213 is about 548.7156953664.

Adding to 165212213 its reverse (312212561), we get a palindrome (477424774).

The spelling of 165212213 in words is "one hundred sixty-five million, two hundred twelve thousand, two hundred thirteen".