11111111111101 has 4 divisors (see below), whose sum is σ = 11191047162400. Its totient is φ = 11031175059804.

The previous prime is 11111111111053. The next prime is 11111111111123. The reversal of 11111111111101 is 10111111111111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11111111111101 - 2¹⁹ = 11111110586813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111111114101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39968025441 + ... + 39968025718.

It is an arithmetic number, because the mean of its divisors is an integer number (2797761790600).

Almost surely, 2^{11111111111101} is an apocalyptic number.

It is an amenable number.

11111111111101 is a deficient number, since it is larger than the sum of its proper divisors (79936051299).

11111111111101 is an equidigital number, since it uses as much as digits as its factorization.

11111111111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79936051298.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 11111111111101 its reverse (10111111111111), we get a palindrome (21222222222212).

It can be divided in two parts, 1111111111110 and 1, that added together give a palindrome (1111111111111).

The spelling of 11111111111101 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred one".