11189090921 has 2 divisors, whose sum is σ = 11189090922. Its totient is φ = 11189090920.

The previous prime is 11189090897. The next prime is 11189090933. The reversal of 11189090921 is 12909098111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7684450921 + 3504640000 = 87661^2 + 59200^2 .

It is a cyclic number.

It is not a de Polignac number, because 11189090921 - 2¹⁰ = 11189089897 is a prime.

It is not a weakly prime, because it can be changed into another prime (11189090951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5594545460 + 5594545461.

It is an arithmetic number, because the mean of its divisors is an integer number (5594545461).

Almost surely, 2^11189090921 is an apocalyptic number.

It is an amenable number.

11189090921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11189090921 is an equidigital number, since it uses as much as digits as its factorization.

11189090921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 11189090921 in words is "eleven billion, one hundred eighty-nine million, ninety thousand, nine hundred twenty-one".