12000000121 has 4 divisors (see below), whose sum is σ = 12021938512. Its totient is φ = 11978061732.

The previous prime is 12000000091. The next prime is 12000000139. The reversal of 12000000121 is 12100000021.

12000000121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12100000021 = 96973 ⋅124777.

It is a cyclic number.

It is not a de Polignac number, because 12000000121 - 2¹⁹ = 11999475833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12000000421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10968375 + ... + 10969468.

It is an arithmetic number, because the mean of its divisors is an integer number (3005484628).

Almost surely, 2^12000000121 is an apocalyptic number.

It is an amenable number.

12000000121 is a deficient number, since it is larger than the sum of its proper divisors (21938391).

12000000121 is an equidigital number, since it uses as much as digits as its factorization.

12000000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21938390.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 12000000121 its reverse (12100000021), we get a palindrome (24100000142).

The spelling of 12000000121 in words is "twelve billion, one hundred twenty-one", and thus it is an aban number.