2111002001001 has 24 divisors (see below), whose sum is σ = 3055219693760. Its totient is φ = 1404569478816.

The previous prime is 2111002000999. The next prime is 2111002001029. The reversal of 2111002001001 is 1001002001112.

It is a happy number.

It is not a de Polignac number, because 2111002001001 - 2¹ = 2111002000999 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2111001001001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16858260 + ... + 16983018.

Almost surely, 2^{2111002001001} is an apocalyptic number.

It is an amenable number.

2111002001001 is a deficient number, since it is larger than the sum of its proper divisors (944217692759).

2111002001001 is a wasteful number, since it uses less digits than its factorization.

2111002001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128445 (or 128442 counting only the distinct ones).

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

Adding to 2111002001001 its reverse (1001002001112), we get a palindrome (3112004002113).

The spelling of 2111002001001 in words is "two trillion, one hundred eleven billion, two million, one thousand, one".