12001231011121 has 4 divisors (see below), whose sum is σ = 13092252012144. Its totient is φ = 10910210010100.

The previous prime is 12001231011073. The next prime is 12001231011149. The reversal of 12001231011121 is 12111013210021.

It is a happy number.

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 12001231011121 - 2²⁹ = 12000694140209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001231011095 and 12001231011104.

It is not an unprimeable number, because it can be changed into a prime (12001231011181) 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, 545510500495 + ... + 545510500516.

It is an arithmetic number, because the mean of its divisors is an integer number (3273063003036).

Almost surely, 2^{12001231011121} is an apocalyptic number.

12001231011121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001231011121 is a deficient number, since it is larger than the sum of its proper divisors (1091021001023).

12001231011121 is a wasteful number, since it uses less digits than its factorization.

12001231011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091021001022.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 12001231011121 its reverse (12111013210021), we get a palindrome (24112244221142).

The spelling of 12001231011121 in words is "twelve trillion, one billion, two hundred thirty-one million, eleven thousand, one hundred twenty-one".