2120111311 has 4 divisors (see below), whose sum is σ = 2138873472. Its totient is φ = 2101349152.

The previous prime is 2120111309. The next prime is 2120111321. The reversal of 2120111311 is 1131110212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2120111311 - 2¹ = 2120111309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120111291 and 2120111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120111321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9380911 + ... + 9381136.

It is an arithmetic number, because the mean of its divisors is an integer number (534718368).

Almost surely, 2^2120111311 is an apocalyptic number.

2120111311 is a deficient number, since it is larger than the sum of its proper divisors (18762161).

2120111311 is a wasteful number, since it uses less digits than its factorization.

2120111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18762160.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2120111311 is about 46044.6664772371. Note that the first 3 decimals coincide. The cubic root of 2120111311 is about 1284.6541405948.

Adding to 2120111311 its reverse (1131110212), we get a palindrome (3251221523).

The spelling of 2120111311 in words is "two billion, one hundred twenty million, one hundred eleven thousand, three hundred eleven".