12103020121 has 4 divisors (see below), whose sum is σ = 12740021200. Its totient is φ = 11466019044.

The previous prime is 12103020089. The next prime is 12103020131. The reversal of 12103020121 is 12102030121.

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 12103020121 - 2⁵ = 12103020089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12103020131) 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, 318500511 + ... + 318500548.

It is an arithmetic number, because the mean of its divisors is an integer number (3185005300).

Almost surely, 2^12103020121 is an apocalyptic number.

It is an amenable number.

12103020121 is a deficient number, since it is larger than the sum of its proper divisors (637001079).

12103020121 is an equidigital number, since it uses as much as digits as its factorization.

12103020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637001078.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12103020121 its reverse (12102030121), we get a palindrome (24205050242).

The spelling of 12103020121 in words is "twelve billion, one hundred three million, twenty thousand, one hundred twenty-one".