12123013231 has 16 divisors (see below), whose sum is σ = 14337460800. Its totient is φ = 10029454848.

The previous prime is 12123013207. The next prime is 12123013241. The reversal of 12123013231 is 13231032121.

It is not a de Polignac number, because 12123013231 - 2¹³ = 12123005039 is a prime.

It is a super-2 number, since 2×12123013231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12123013199 and 12123013208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123013241) 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, 725175 + ... + 741703.

It is an arithmetic number, because the mean of its divisors is an integer number (896091300).

Almost surely, 2^12123013231 is an apocalyptic number.

12123013231 is a deficient number, since it is larger than the sum of its proper divisors (2214447569).

12123013231 is a wasteful number, since it uses less digits than its factorization.

12123013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20178.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12123013231 its reverse (13231032121), we get a palindrome (25354045352).

The spelling of 12123013231 in words is "twelve billion, one hundred twenty-three million, thirteen thousand, two hundred thirty-one".