12138306321 has 16 divisors (see below), whose sum is σ = 16727720384. Its totient is φ = 7823335104.

The previous prime is 12138306319. The next prime is 12138306353. The reversal of 12138306321 is 12360383121.

It is not a de Polignac number, because 12138306321 - 2¹ = 12138306319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12138306371) 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, 330835 + ... + 365688.

It is an arithmetic number, because the mean of its divisors is an integer number (1045482524).

Almost surely, 2^12138306321 is an apocalyptic number.

It is an amenable number.

12138306321 is a deficient number, since it is larger than the sum of its proper divisors (4589414063).

12138306321 is a wasteful number, since it uses less digits than its factorization.

12138306321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696720.

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 12138306321 its reverse (12360383121), we get a palindrome (24498689442).

The spelling of 12138306321 in words is "twelve billion, one hundred thirty-eight million, three hundred six thousand, three hundred twenty-one".