12123031211 has 16 divisors (see below), whose sum is σ = 13438807200. Its totient is φ = 10883701248.

The previous prime is 12123031183. The next prime is 12123031243. The reversal of 12123031211 is 11213032121.

It is a cyclic number.

It is not a de Polignac number, because 12123031211 - 2⁶ = 12123031147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 12123031211.

It is not an unprimeable number, because it can be changed into a prime (12123031511) 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, 107216 + ... + 189053.

It is an arithmetic number, because the mean of its divisors is an integer number (839925450).

Almost surely, 2^12123031211 is an apocalyptic number.

12123031211 is a deficient number, since it is larger than the sum of its proper divisors (1315775989).

12123031211 is a wasteful number, since it uses less digits than its factorization.

12123031211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296398.

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

Adding to 12123031211 its reverse (11213032121), we get a palindrome (23336063332).

The spelling of 12123031211 in words is "twelve billion, one hundred twenty-three million, thirty-one thousand, two hundred eleven".