12001001011001 has 16 divisors (see below), whose sum is σ = 12892045501440. Its totient is φ = 11146247394240.

The previous prime is 12001001010989. The next prime is 12001001011007. The reversal of 12001001011001 is 10011010010021.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001001011001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12001001011001.

It is not an unprimeable number, because it can be changed into a prime (12001001011007) 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, 39817766 + ... + 40118031.

It is an arithmetic number, because the mean of its divisors is an integer number (805752843840).

Almost surely, 2^{12001001011001} is an apocalyptic number.

It is an amenable number.

12001001011001 is a deficient number, since it is larger than the sum of its proper divisors (891044490439).

12001001011001 is a wasteful number, since it uses less digits than its factorization.

12001001011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79936024.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 12001001011001 its reverse (10011010010021), we get a palindrome (22012011021022).

The spelling of 12001001011001 in words is "twelve trillion, one billion, one million, eleven thousand, one".