123123213111 has 4 divisors (see below), whose sum is σ = 164164284152. Its totient is φ = 82082142072.

The previous prime is 123123213097. The next prime is 123123213119. The reversal of 123123213111 is 111312321321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111312321321 = 3 ⋅37104107107.

It is not a de Polignac number, because 123123213111 - 2⁵ = 123123213079 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 (123123213119) 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, 20520535516 + ... + 20520535521.

It is an arithmetic number, because the mean of its divisors is an integer number (41041071038).

Almost surely, 2^123123213111 is an apocalyptic number.

123123213111 is a deficient number, since it is larger than the sum of its proper divisors (41041071041).

123123213111 is an equidigital number, since it uses as much as digits as its factorization.

123123213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41041071040.

The product of its digits is 216, while the sum is 21.

Adding to 123123213111 its reverse (111312321321), we get a palindrome (234435534432).

The spelling of 123123213111 in words is "one hundred twenty-three billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred eleven".