99121111111 has 8 divisors (see below), whose sum is σ = 109500883200. Its totient is φ = 88969466040.

The previous prime is 99121111109. The next prime is 99121111129. The reversal of 99121111111 is 11111112199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99121111111 - 2¹ = 99121111109 is a prime.

It is a Duffinian number.

99121111111 is a modest number, since divided by 111111 gives 99121 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 99121111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121111181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57030841 + ... + 57032578.

It is an arithmetic number, because the mean of its divisors is an integer number (13687610400).

Almost surely, 2^99121111111 is an apocalyptic number.

99121111111 is a deficient number, since it is larger than the sum of its proper divisors (10379772089).

99121111111 is a wasteful number, since it uses less digits than its factorization.

99121111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114063509.

The product of its digits is 162, while the sum is 28.

The spelling of 99121111111 in words is "ninety-nine billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".