12121320123 has 24 divisors (see below), whose sum is σ = 20105542080. Its totient is φ = 6959608560.

The previous prime is 12121320067. The next prime is 12121320173. The reversal of 12121320123 is 32102312121.

It is not a de Polignac number, because 12121320123 - 2⁹ = 12121319611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121320096 and 12121320105.

It is not an unprimeable number, because it can be changed into a prime (12121320173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3220161 + ... + 3223922.

It is an arithmetic number, because the mean of its divisors is an integer number (837730920).

Almost surely, 2^12121320123 is an apocalyptic number.

12121320123 is a deficient number, since it is larger than the sum of its proper divisors (7984221957).

12121320123 is a wasteful number, since it uses less digits than its factorization.

12121320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444119 (or 6444116 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12121320123 its reverse (32102312121), we get a palindrome (44223632244).

The spelling of 12121320123 in words is "twelve billion, one hundred twenty-one million, three hundred twenty thousand, one hundred twenty-three".