2120211111 has 16 divisors (see below), whose sum is σ = 2908049408. Its totient is φ = 1373047200.

The previous prime is 2120211109. The next prime is 2120211157. The reversal of 2120211111 is 1111120212.

It is not a de Polignac number, because 2120211111 - 2¹ = 2120211109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120211101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54906 + ... + 85176.

It is an arithmetic number, because the mean of its divisors is an integer number (181753088).

Almost surely, 2^2120211111 is an apocalyptic number.

2120211111 is a deficient number, since it is larger than the sum of its proper divisors (787838297).

2120211111 is a wasteful number, since it uses less digits than its factorization.

2120211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30942.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 2120211111 is about 46045.7501947791. The cubic root of 2120211111 is about 1284.6742977867.

Adding to 2120211111 its reverse (1111120212), we get a palindrome (3231331323).

The spelling of 2120211111 in words is "two billion, one hundred twenty million, two hundred eleven thousand, one hundred eleven".