11001111111001 has 16 divisors (see below), whose sum is σ = 12052440360000. Its totient is φ = 9958410649600.

The previous prime is 11001111110999. The next prime is 11001111111127. The reversal of 11001111111001 is 10011111110011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11001111111001 - 2¹ = 11001111110999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001111111401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156825 + ... + 4693273.

It is an arithmetic number, because the mean of its divisors is an integer number (753277522500).

Almost surely, 2^{11001111111001} is an apocalyptic number.

11001111111001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001111111001 is a deficient number, since it is larger than the sum of its proper divisors (1051329248999).

11001111111001 is a wasteful number, since it uses less digits than its factorization.

11001111111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537400.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 11001111111001 its reverse (10011111110011), we get a palindrome (21012222221012).

The spelling of 11001111111001 in words is "eleven trillion, one billion, one hundred eleven million, one hundred eleven thousand, one".