11112220111 has 2 divisors, whose sum is σ = 11112220112. Its totient is φ = 11112220110.

The previous prime is 11112220109. The next prime is 11112220117. The reversal of 11112220111 is 11102221111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11112220111 - 2¹ = 11112220109 is a prime.

Together with 11112220109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11112220091 and 11112220100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11112220117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556110055 + 5556110056.

It is an arithmetic number, because the mean of its divisors is an integer number (5556110056).

Almost surely, 2^11112220111 is an apocalyptic number.

11112220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112220111 is an equidigital number, since it uses as much as digits as its factorization.

11112220111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11112220111 its reverse (11102221111), we get a palindrome (22214441222).

It can be divided in two parts, 1111 and 2220111, that added together give a palindrome (2221222).

The spelling of 11112220111 in words is "eleven billion, one hundred twelve million, two hundred twenty thousand, one hundred eleven".