201111101111 has 8 divisors (see below), whose sum is σ = 201709043424. Its totient is φ = 200513971840.

The previous prime is 201111101083. The next prime is 201111101171. The reversal of 201111101111 is 111101111102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 201111101111 - 2²² = 201106906807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111101092 and 201111101101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111101171) 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, 293990 + ... + 699036.

It is an arithmetic number, because the mean of its divisors is an integer number (25213630428).

Almost surely, 2^201111101111 is an apocalyptic number.

201111101111 is a deficient number, since it is larger than the sum of its proper divisors (597942313).

201111101111 is an equidigital number, since it uses as much as digits as its factorization.

201111101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406521.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 201111101111 its reverse (111101111102), we get a palindrome (312212212213).

Subtracting from 201111101111 its reverse (111101111102), we obtain a palindrome (90009990009).

The spelling of 201111101111 in words is "two hundred one billion, one hundred eleven million, one hundred one thousand, one hundred eleven".