20001201011111 has 2 divisors, whose sum is σ = 20001201011112. Its totient is φ = 20001201011110.

The previous prime is 20001201011039. The next prime is 20001201011149. The reversal of 20001201011111 is 11111010210002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001201011111 - 2³⁸ = 19726323104167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001201011092 and 20001201011101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001201011191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000600505555 + 10000600505556.

It is an arithmetic number, because the mean of its divisors is an integer number (10000600505556).

Almost surely, 2^{20001201011111} is an apocalyptic number.

20001201011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001201011111 is an equidigital number, since it uses as much as digits as its factorization.

20001201011111 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 11.

Adding to 20001201011111 its reverse (11111010210002), we get a palindrome (31112211221113).

The spelling of 20001201011111 in words is "twenty trillion, one billion, two hundred one million, eleven thousand, one hundred eleven".