12001221011121 has 8 divisors (see below), whose sum is σ = 16002943878624. Its totient is φ = 8000156075520.

The previous prime is 12001221011089. The next prime is 12001221011141. The reversal of 12001221011121 is 12111012210021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12001221011121 - 2⁵ = 12001221011089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12001221011121.

It is not an unprimeable number, because it can be changed into a prime (12001221011141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164440411 + ... + 164513376.

It is an arithmetic number, because the mean of its divisors is an integer number (2000367984828).

Almost surely, 2^{12001221011121} is an apocalyptic number.

It is an amenable number.

12001221011121 is a deficient number, since it is larger than the sum of its proper divisors (4001722867503).

12001221011121 is a wasteful number, since it uses less digits than its factorization.

12001221011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328965951.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12001221011121 its reverse (12111012210021), we get a palindrome (24112233221142).

The spelling of 12001221011121 in words is "twelve trillion, one billion, two hundred twenty-one million, eleven thousand, one hundred twenty-one".