123011213111 has 4 divisors (see below), whose sum is σ = 123082691424. Its totient is φ = 122939734800.

The previous prime is 123011213089. The next prime is 123011213153. The reversal of 123011213111 is 111312110321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111312110321 = 197 ⋅565036093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123011213111 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 123011213111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123010213111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35736575 + ... + 35740016.

It is an arithmetic number, because the mean of its divisors is an integer number (30770672856).

Almost surely, 2^123011213111 is an apocalyptic number.

123011213111 is a deficient number, since it is larger than the sum of its proper divisors (71478313).

123011213111 is an equidigital number, since it uses as much as digits as its factorization.

123011213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71478312.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 123011213111 its reverse (111312110321), we get a palindrome (234323323432).

The spelling of 123011213111 in words is "one hundred twenty-three billion, eleven million, two hundred thirteen thousand, one hundred eleven".