20201111011111 has 2 divisors, whose sum is σ = 20201111011112. Its totient is φ = 20201111011110.

The previous prime is 20201111011097. The next prime is 20201111011181. The reversal of 20201111011111 is 11111011110202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201111011111 - 2¹⁵ = 20201110978343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20201111011091 and 20201111011100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201111011181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100555505555 + 10100555505556.

It is an arithmetic number, because the mean of its divisors is an integer number (10100555505556).

Almost surely, 2^{20201111011111} is an apocalyptic number.

20201111011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201111011111 is an equidigital number, since it uses as much as digits as its factorization.

20201111011111 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 13.

Adding to 20201111011111 its reverse (11111011110202), we get a palindrome (31312122121313).

Subtracting from 20201111011111 its reverse (11111011110202), we obtain a palindrome (9090099900909).

The spelling of 20201111011111 in words is "twenty trillion, two hundred one billion, one hundred eleven million, eleven thousand, one hundred eleven".