2111122111 has 8 divisors (see below), whose sum is σ = 2417669120. Its totient is φ = 1805814648.

The previous prime is 2111122081. The next prime is 2111122147. The reversal of 2111122111 is 1112211112.

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 2111122111 - 2¹⁷ = 2110991039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111122091 and 2111122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111122151) 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, 306231 + ... + 313048.

It is an arithmetic number, because the mean of its divisors is an integer number (302208640).

Almost surely, 2^2111122111 is an apocalyptic number.

2111122111 is a deficient number, since it is larger than the sum of its proper divisors (306547009).

2111122111 is an equidigital number, since it uses as much as digits as its factorization.

2111122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619773.

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

The square root of 2111122111 is about 45946.9488758503. The cubic root of 2111122111 is about 1282.8359384788.

Adding to 2111122111 its reverse (1112211112), we get a palindrome (3223333223).

The spelling of 2111122111 in words is "two billion, one hundred eleven million, one hundred twenty-two thousand, one hundred eleven".