91121110212111 has 32 divisors (see below), whose sum is σ = 139536250828800. Its totient is φ = 51812413037280.

The previous prime is 91121110212109. The next prime is 91121110212131. The reversal of 91121110212111 is 11121201112119.

It is not a de Polignac number, because 91121110212111 - 2¹ = 91121110212109 is a prime.

It is a super-3 number, since 3×91121110212111³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91121110212131) 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 in 31 ways as a sum of consecutive naturals, for example, 20962780 + ... + 24933518.

It is an arithmetic number, because the mean of its divisors is an integer number (4360507838400).

Almost surely, 2^{91121110212111} is an apocalyptic number.

91121110212111 is a deficient number, since it is larger than the sum of its proper divisors (48415140616689).

91121110212111 is a wasteful number, since it uses less digits than its factorization.

91121110212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976139.

The product of its (nonzero) digits is 72, while the sum is 24.

The spelling of 91121110212111 in words is "ninety-one trillion, one hundred twenty-one billion, one hundred ten million, two hundred twelve thousand, one hundred eleven".