20111012011 has 2 divisors, whose sum is σ = 20111012012. Its totient is φ = 20111012010.

The previous prime is 20111011933. The next prime is 20111012027. The reversal of 20111012011 is 11021011102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111012011 - 2⁹ = 20111011499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111016011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055506005 + 10055506006.

It is an arithmetic number, because the mean of its divisors is an integer number (10055506006).

Almost surely, 2^20111012011 is an apocalyptic number.

20111012011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111012011 is an equidigital number, since it uses as much as digits as its factorization.

20111012011 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20111012011 its reverse (11021011102), we get a palindrome (31132023113).

Subtracting from 20111012011 its reverse (11021011102), we obtain a palindrome (9090000909).

The spelling of 20111012011 in words is "twenty billion, one hundred eleven million, twelve thousand, eleven".