213111123211 has 16 divisors (see below), whose sum is σ = 247224225024. Its totient is φ = 179915925024.

The previous prime is 213111123187. The next prime is 213111123227. The reversal of 213111123211 is 112321111312.

It is a cyclic number.

It is not a de Polignac number, because 213111123211 - 2⁵ = 213111123179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213111121211) 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, 3994236 + ... + 4047238.

It is an arithmetic number, because the mean of its divisors is an integer number (15451514064).

Almost surely, 2^213111123211 is an apocalyptic number.

213111123211 is a deficient number, since it is larger than the sum of its proper divisors (34113101813).

213111123211 is an equidigital number, since it uses as much as digits as its factorization.

213111123211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61650.

The product of its digits is 72, while the sum is 19.

Adding to 213111123211 its reverse (112321111312), we get a palindrome (325432234523).

The spelling of 213111123211 in words is "two hundred thirteen billion, one hundred eleven million, one hundred twenty-three thousand, two hundred eleven".