2120011111 has 2 divisors, whose sum is σ = 2120011112. Its totient is φ = 2120011110.

The previous prime is 2120011097. The next prime is 2120011123. The reversal of 2120011111 is 1111100212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2120011111 - 2⁵ = 2120011079 is a prime.

It is a super-2 number, since 2×2120011111² = 8988894221526908642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120011711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060005555 + 1060005556.

It is an arithmetic number, because the mean of its divisors is an integer number (1060005556).

Almost surely, 2^2120011111 is an apocalyptic number.

2120011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120011111 is an equidigital number, since it uses as much as digits as its factorization.

2120011111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 2120011111 is about 46043.5783904770. The cubic root of 2120011111 is about 1284.6339019762.

Adding to 2120011111 its reverse (1111100212), we get a palindrome (3231111323).

The spelling of 2120011111 in words is "two billion, one hundred twenty million, eleven thousand, one hundred eleven".