12001211011001 has 32 divisors (see below), whose sum is σ = 12976892651520. Its totient is φ = 11072963430144.

The previous prime is 12001211010961. The next prime is 12001211011039. The reversal of 12001211011001 is 10011011210021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001211011001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12001211001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14037860 + ... + 14868218.

It is an arithmetic number, because the mean of its divisors is an integer number (405527895360).

Almost surely, 2^{12001211011001} is an apocalyptic number.

It is an amenable number.

12001211011001 is a deficient number, since it is larger than the sum of its proper divisors (975681640519).

12001211011001 is a wasteful number, since it uses less digits than its factorization.

12001211011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830645.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12001211011001 its reverse (10011011210021), we get a palindrome (22012222221022).

It can be divided in two parts, 1200121 and 1011001, that added together give a palindrome (2211122).

The spelling of 12001211011001 in words is "twelve trillion, one billion, two hundred eleven million, eleven thousand, one".