11221998989 has 2 divisors, whose sum is σ = 11221998990. Its totient is φ = 11221998988.

The previous prime is 11221998881. The next prime is 11221999021. The reversal of 11221998989 is 98989912211.

11221998989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10807265764 + 414733225 = 103958^2 + 20365^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221998989 - 2¹⁶ = 11221933453 is a prime.

It is a super-2 number, since 2×11221998989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221994989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610999494 + 5610999495.

It is an arithmetic number, because the mean of its divisors is an integer number (5610999495).

Almost surely, 2^11221998989 is an apocalyptic number.

It is an amenable number.

11221998989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221998989 is an equidigital number, since it uses as much as digits as its factorization.

11221998989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 59.

The spelling of 11221998989 in words is "eleven billion, two hundred twenty-one million, nine hundred ninety-eight thousand, nine hundred eighty-nine".