11900111110021 has 2 divisors, whose sum is σ = 11900111110022. Its totient is φ = 11900111110020.

The previous prime is 11900111110009. The next prime is 11900111110061. The reversal of 11900111110021 is 12001111100911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6375049312996 + 5525061797025 = 2524886^2 + 2350545^2 .

It is an emirp because it is prime and its reverse (12001111100911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11900111110021 - 2⁷ = 11900111109893 is a prime.

It is a super-2 number, since 2×11900111110021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11900111110061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5950055555010 + 5950055555011.

It is an arithmetic number, because the mean of its divisors is an integer number (5950055555011).

Almost surely, 2^{11900111110021} is an apocalyptic number.

It is an amenable number.

11900111110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11900111110021 is an equidigital number, since it uses as much as digits as its factorization.

11900111110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 19.

Adding to 11900111110021 its reverse (12001111100911), we get a palindrome (23901222210932).

It can be divided in two parts, 1190011 and 1110021, that added together give a palindrome (2300032).

The spelling of 11900111110021 in words is "eleven trillion, nine hundred billion, one hundred eleven million, one hundred ten thousand, twenty-one".