2113123211 has 4 divisors (see below), whose sum is σ = 2113359192. Its totient is φ = 2112887232.

The previous prime is 2113123147. The next prime is 2113123241. The reversal of 2113123211 is 1123213112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2113123211 - 2⁶ = 2113123147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2113123211.

It is not an unprimeable number, because it can be changed into a prime (2113123241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104006 + ... + 122651.

It is an arithmetic number, because the mean of its divisors is an integer number (528339798).

Almost surely, 2^2113123211 is an apocalyptic number.

2113123211 is a deficient number, since it is larger than the sum of its proper divisors (235981).

2113123211 is an equidigital number, since it uses as much as digits as its factorization.

2113123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235980.

The product of its digits is 72, while the sum is 17.

The square root of 2113123211 is about 45968.7199190928. The cubic root of 2113123211 is about 1283.2411372608.

Adding to 2113123211 its reverse (1123213112), we get a palindrome (3236336323).

The spelling of 2113123211 in words is "two billion, one hundred thirteen million, one hundred twenty-three thousand, two hundred eleven".