111111122011 has 4 divisors (see below), whose sum is σ = 112449810312. Its totient is φ = 109772433712.

The previous prime is 111111121999. The next prime is 111111122071. The reversal of 111111122011 is 110221111111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110221111111 = 17431 ⋅6323281.

It is a cyclic number.

It is not a de Polignac number, because 111111122011 - 2¹¹ = 111111119963 is a prime.

It is a super-3 number, since 3×111111122011³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111121982 and 111111122000.

It is not an unprimeable number, because it can be changed into a prime (111111122071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669344026 + ... + 669344191.

It is an arithmetic number, because the mean of its divisors is an integer number (28112452578).

Almost surely, 2^111111122011 is an apocalyptic number.

111111122011 is a deficient number, since it is larger than the sum of its proper divisors (1338688301).

111111122011 is an equidigital number, since it uses as much as digits as its factorization.

111111122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338688300.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111111122011 its reverse (110221111111), we get a palindrome (221332233122).

The spelling of 111111122011 in words is "one hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, eleven".