99991210220111 has 4 divisors (see below), whose sum is σ = 114275668822992. Its totient is φ = 85706751617232.

The previous prime is 99991210220093. The next prime is 99991210220113. The reversal of 99991210220111 is 11102201219999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99991210220111 - 2³⁴ = 99974030350927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99991210220113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7142229301430 + ... + 7142229301443.

It is an arithmetic number, because the mean of its divisors is an integer number (28568917205748).

Almost surely, 2^{99991210220111} is an apocalyptic number.

99991210220111 is a deficient number, since it is larger than the sum of its proper divisors (14284458602881).

99991210220111 is a wasteful number, since it uses less digits than its factorization.

99991210220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14284458602880.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 99991210220111 in words is "ninety-nine trillion, nine hundred ninety-one billion, two hundred ten million, two hundred twenty thousand, one hundred eleven".