12121002121 has 4 divisors (see below), whose sum is σ = 12121484544. Its totient is φ = 12120519700.

The previous prime is 12121002119. The next prime is 12121002143. The reversal of 12121002121 is 12120012121.

12121002121 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.

It is a cyclic number.

It is not a de Polignac number, because 12121002121 - 2¹ = 12121002119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121002191) 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, 201325 + ... + 254506.

It is an arithmetic number, because the mean of its divisors is an integer number (3030371136).

Almost surely, 2^12121002121 is an apocalyptic number.

It is an amenable number.

12121002121 is a deficient number, since it is larger than the sum of its proper divisors (482423).

12121002121 is an equidigital number, since it uses as much as digits as its factorization.

12121002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12121002121 its reverse (12120012121), we get a palindrome (24241014242).

The spelling of 12121002121 in words is "twelve billion, one hundred twenty-one million, two thousand, one hundred twenty-one".