11212319891 has 2 divisors, whose sum is σ = 11212319892. Its totient is φ = 11212319890.

The previous prime is 11212319873. The next prime is 11212319917. The reversal of 11212319891 is 19891321211.

11212319891 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 11212319891 - 2¹⁰ = 11212318867 is a prime.

It is a super-2 number, since 2×11212319891² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11212319801) 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, 5606159945 + 5606159946.

It is an arithmetic number, because the mean of its divisors is an integer number (5606159946).

Almost surely, 2^11212319891 is an apocalyptic number.

11212319891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212319891 is an equidigital number, since it uses as much as digits as its factorization.

11212319891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 38.

The spelling of 11212319891 in words is "eleven billion, two hundred twelve million, three hundred nineteen thousand, eight hundred ninety-one".