11011111011111 has 8 divisors (see below), whose sum is σ = 14681507272960. Its totient is φ = 7340727711672.

The previous prime is 11011111011079. The next prime is 11011111011137. The reversal of 11011111011111 is 11111011111011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11011111011111 - 2⁵ = 11011111011079 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 (11011111011181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1046245 + ... + 4807998.

It is an arithmetic number, because the mean of its divisors is an integer number (1835188409120).

Almost surely, 2^{11011111011111} is an apocalyptic number.

11011111011111 is a deficient number, since it is larger than the sum of its proper divisors (3670396261849).

11011111011111 is an equidigital number, since it uses as much as digits as its factorization.

11011111011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6481205.

The product of its (nonzero) digits is 1, while the sum is 12.

Adding to 11011111011111 its reverse (11111011111011), we get a palindrome (22122122122122).

It can be divided in two parts, 11011111011 and 111, that multiplied together give a palindrome (1222233322221).

The spelling of 11011111011111 in words is "eleven trillion, eleven billion, one hundred eleven million, eleven thousand, one hundred eleven".