20001201209911 has 2 divisors, whose sum is σ = 20001201209912. Its totient is φ = 20001201209910.

The previous prime is 20001201209909. The next prime is 20001201209959. The reversal of 20001201209911 is 11990210210002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001201209911 - 2¹ = 20001201209909 is a prime.

Together with 20001201209909, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20001201209911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001201209711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000600604955 + 10000600604956.

It is an arithmetic number, because the mean of its divisors is an integer number (10000600604956).

Almost surely, 2^{20001201209911} is an apocalyptic number.

20001201209911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001201209911 is an equidigital number, since it uses as much as digits as its factorization.

20001201209911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

Adding to 20001201209911 its reverse (11990210210002), we get a palindrome (31991411419913).

The spelling of 20001201209911 in words is "twenty trillion, one billion, two hundred one million, two hundred nine thousand, nine hundred eleven".