12121000121 has 4 divisors (see below), whose sum is σ = 12122611200. Its totient is φ = 12119389044.

The previous prime is 12121000117. The next prime is 12121000123. The reversal of 12121000121 is 12100012121.

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: 12100012121 = 97 ⋅124742393.

It is a cyclic number.

It is not a de Polignac number, because 12121000121 - 2² = 12121000117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121000123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794201 + ... + 809318.

It is an arithmetic number, because the mean of its divisors is an integer number (3030652800).

Almost surely, 2^12121000121 is an apocalyptic number.

It is an amenable number.

12121000121 is a deficient number, since it is larger than the sum of its proper divisors (1611079).

12121000121 is an equidigital number, since it uses as much as digits as its factorization.

12121000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611078.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12121000121 its reverse (12100012121), we get a palindrome (24221012242).

The spelling of 12121000121 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.