2120111111 has 6 divisors (see below), whose sum is σ = 2190708936. Its totient is φ = 2051719500.

The previous prime is 2120111093. The next prime is 2120111153. The reversal of 2120111111 is 1111110212.

It is not a de Polignac number, because 2120111111 - 2⁶ = 2120111047 is a prime.

It is a super-2 number, since 2×2120111111² = 8989742245971308642, which contains 22 as substring.

It is a Duffinian number.

2120111111 is a modest number, since divided by 111111 gives 2120 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2120111092 and 2120111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120111011) 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 5 ways as a sum of consecutive naturals, for example, 1102115 + ... + 1104036.

It is an arithmetic number, because the mean of its divisors is an integer number (365118156).

Almost surely, 2^2120111111 is an apocalyptic number.

2120111111 is a deficient number, since it is larger than the sum of its proper divisors (70597825).

2120111111 is an equidigital number, since it uses as much as digits as its factorization.

2120111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206213 (or 2206182 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 2120111111 is about 46044.6643054328. The cubic root of 2120111111 is about 1284.6541001990.

Adding to 2120111111 its reverse (1111110212), we get a palindrome (3231221323).

The spelling of 2120111111 in words is "two billion, one hundred twenty million, one hundred eleven thousand, one hundred eleven".