12121013123 has 4 divisors (see below), whose sum is σ = 12123131640. Its totient is φ = 12118894608.

The previous prime is 12121013119. The next prime is 12121013129. The reversal of 12121013123 is 32131012121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121013123 - 2² = 12121013119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121013129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050653 + ... + 1062126.

It is an arithmetic number, because the mean of its divisors is an integer number (3030782910).

Almost surely, 2^12121013123 is an apocalyptic number.

12121013123 is a deficient number, since it is larger than the sum of its proper divisors (2118517).

12121013123 is an equidigital number, since it uses as much as digits as its factorization.

12121013123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118516.

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

Adding to 12121013123 its reverse (32131012121), we get a palindrome (44252025244).

The spelling of 12121013123 in words is "twelve billion, one hundred twenty-one million, thirteen thousand, one hundred twenty-three".