12130123121 has 4 divisors (see below), whose sum is σ = 12131392500. Its totient is φ = 12128853744.

The previous prime is 12130123087. The next prime is 12130123151. The reversal of 12130123121 is 12132103121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12132103121 = 2879 ⋅4213999.

It can be written as a sum of positive squares in 2 ways, for example, as 7377951025 + 4752172096 = 85895^2 + 68936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12130123121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12130123121.

It is not an unprimeable number, because it can be changed into a prime (12130123151) 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, 620246 + ... + 639503.

It is an arithmetic number, because the mean of its divisors is an integer number (3032848125).

Almost surely, 2^12130123121 is an apocalyptic number.

It is an amenable number.

12130123121 is a deficient number, since it is larger than the sum of its proper divisors (1269379).

12130123121 is an equidigital number, since it uses as much as digits as its factorization.

12130123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269378.

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

Adding to 12130123121 its reverse (12132103121), we get a palindrome (24262226242).

The spelling of 12130123121 in words is "twelve billion, one hundred thirty million, one hundred twenty-three thousand, one hundred twenty-one".