12001211221011 has 16 divisors (see below), whose sum is σ = 16213836240000. Its totient is φ = 7895057151168.

The previous prime is 12001211220989. The next prime is 12001211221067. The reversal of 12001211221011 is 11012211210021.

It is a happy number.

It is not a de Polignac number, because 12001211221011 - 2⁹ = 12001211220499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12001211241011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44905201 + ... + 45171666.

It is an arithmetic number, because the mean of its divisors is an integer number (1013364765000).

Almost surely, 2^{12001211221011} is an apocalyptic number.

12001211221011 is a deficient number, since it is larger than the sum of its proper divisors (4212625018989).

12001211221011 is an equidigital number, since it uses as much as digits as its factorization.

12001211221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90077458.

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

Adding to 12001211221011 its reverse (11012211210021), we get a palindrome (23013422431032).

The spelling of 12001211221011 in words is "twelve trillion, one billion, two hundred eleven million, two hundred twenty-one thousand, eleven".