91000021022111 has 2 divisors, whose sum is σ = 91000021022112. Its totient is φ = 91000021022110.

The previous prime is 91000021022081. The next prime is 91000021022123. The reversal of 91000021022111 is 11122012000019.

It is a strong prime.

It is an emirp because it is prime and its reverse (11122012000019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91000021022111 - 2³⁴ = 90982841152927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91000021022161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500010511055 + 45500010511056.

It is an arithmetic number, because the mean of its divisors is an integer number (45500010511056).

Almost surely, 2^{91000021022111} is an apocalyptic number.

91000021022111 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000021022111 is an equidigital number, since it uses as much as digits as its factorization.

91000021022111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 91000021022111 in words is "ninety-one trillion, twenty-one million, twenty-two thousand, one hundred eleven".