11211021187 has 2 divisors, whose sum is σ = 11211021188. Its totient is φ = 11211021186.

The previous prime is 11211021179. The next prime is 11211021247. The reversal of 11211021187 is 78112011211.

11211021187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11211021187 - 2³ = 11211021179 is a prime.

It is not a weakly prime, because it can be changed into another prime (11211021287) 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, 5605510593 + 5605510594.

It is an arithmetic number, because the mean of its divisors is an integer number (5605510594).

Almost surely, 2^11211021187 is an apocalyptic number.

11211021187 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211021187 is an equidigital number, since it uses as much as digits as its factorization.

11211021187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 25.

Adding to 11211021187 its reverse (78112011211), we get a palindrome (89323032398).

The spelling of 11211021187 in words is "eleven billion, two hundred eleven million, twenty-one thousand, one hundred eighty-seven".