9891011212111 has 2 divisors, whose sum is σ = 9891011212112. Its totient is φ = 9891011212110.

The previous prime is 9891011212097. The next prime is 9891011212153. The reversal of 9891011212111 is 1112121101989.

It is a weak prime.

It is an emirp because it is prime and its reverse (1112121101989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9891011212111 - 2³¹ = 9888863728463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9891011212211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945505606055 + 4945505606056.

It is an arithmetic number, because the mean of its divisors is an integer number (4945505606056).

Almost surely, 2^{9891011212111} is an apocalyptic number.

9891011212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891011212111 is an equidigital number, since it uses as much as digits as its factorization.

9891011212111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 37.

The spelling of 9891011212111 in words is "nine trillion, eight hundred ninety-one billion, eleven million, two hundred twelve thousand, one hundred eleven".