11800020021121 has 2 divisors, whose sum is σ = 11800020021122. Its totient is φ = 11800020021120.

The previous prime is 11800020021109. The next prime is 11800020021149. The reversal of 11800020021121 is 12112002000811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11482853940496 + 317166080625 = 3388636^2 + 563175^2 .

It is an emirp because it is prime and its reverse (12112002000811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11800020021121 is a prime.

It is not a weakly prime, because it can be changed into another prime (11800020021191) 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, 5900010010560 + 5900010010561.

It is an arithmetic number, because the mean of its divisors is an integer number (5900010010561).

Almost surely, 2^{11800020021121} is an apocalyptic number.

It is an amenable number.

11800020021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11800020021121 is an equidigital number, since it uses as much as digits as its factorization.

11800020021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11800020021121 its reverse (12112002000811), we get a palindrome (23912022021932).

The spelling of 11800020021121 in words is "eleven trillion, eight hundred billion, twenty million, twenty-one thousand, one hundred twenty-one".