12111000002001 has 12 divisors (see below), whose sum is σ = 17590316764020. Its totient is φ = 8029392265440.

The previous prime is 12111000001999. The next prime is 12111000002011. The reversal of 12111000002001 is 10020000011121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2721678362001 + 9389321640000 = 1649751^2 + 3064200^2 .

It is not a de Polignac number, because 12111000002001 - 2¹ = 12111000001999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12111000002011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3717309606 + ... + 3717312863.

It is an arithmetic number, because the mean of its divisors is an integer number (1465859730335).

Almost surely, 2^{12111000002001} is an apocalyptic number.

It is an amenable number.

12111000002001 is a deficient number, since it is larger than the sum of its proper divisors (5479316762019).

12111000002001 is a wasteful number, since it uses less digits than its factorization.

12111000002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7434622656 (or 7434622653 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12111000002001 its reverse (10020000011121), we get a palindrome (22131000013122).

The spelling of 12111000002001 in words is "twelve trillion, one hundred eleven billion, two thousand, one".