12123221131 has 4 divisors (see below), whose sum is σ = 13855109872. Its totient is φ = 10391332392.

The previous prime is 12123221107. The next prime is 12123221141. The reversal of 12123221131 is 13112232121.

12123221131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12123221131 - 2⁷ = 12123221003 is a prime.

It is a super-2 number, since 2×12123221131² (a number of 21 digits) contains 22 as substring.

It is the 110106-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123221099 and 12123221108.

It is not an unprimeable number, because it can be changed into a prime (12123221141) by changing a digit.

It is a nontrivial repunit in base 110105.

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, 865944360 + ... + 865944373.

It is an arithmetic number, because the mean of its divisors is an integer number (3463777468).

Almost surely, 2^12123221131 is an apocalyptic number.

12123221131 is a deficient number, since it is larger than the sum of its proper divisors (1731888741).

12123221131 is an equidigital number, since it uses as much as digits as its factorization.

12123221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731888740.

The product of its digits is 144, while the sum is 19.

Adding to 12123221131 its reverse (13112232121), we get a palindrome (25235453252).

The spelling of 12123221131 in words is "twelve billion, one hundred twenty-three million, two hundred twenty-one thousand, one hundred thirty-one".