11111020111 has 4 divisors (see below), whose sum is σ = 11267513424. Its totient is φ = 10954526800.

The previous prime is 11111020091. The next prime is 11111020121. The reversal of 11111020111 is 11102011111.

11111020111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111020111 - 2¹¹ = 11111018063 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 (11111020121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78246550 + ... + 78246691.

It is an arithmetic number, because the mean of its divisors is an integer number (2816878356).

Almost surely, 2^11111020111 is an apocalyptic number.

11111020111 is a deficient number, since it is larger than the sum of its proper divisors (156493313).

11111020111 is an equidigital number, since it uses as much as digits as its factorization.

11111020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156493312.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11111020111 its reverse (11102011111), we get a palindrome (22213031222).

It can be divided in two parts, 11 and 111020111, that multiplied together give a palindrome (1221221221).

The spelling of 11111020111 in words is "eleven billion, one hundred eleven million, twenty thousand, one hundred eleven".