111121012091 has 16 divisors (see below), whose sum is σ = 120260681856. Its totient is φ = 102274277376.

The previous prime is 111121012063. The next prime is 111121012127. The reversal of 111121012091 is 190210121111.

It is a cyclic number.

It is not a de Polignac number, because 111121012091 - 2²⁶ = 111053903227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121012021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915245 + ... + 1029521.

It is an arithmetic number, because the mean of its divisors is an integer number (7516292616).

Almost surely, 2^111121012091 is an apocalyptic number.

111121012091 is a deficient number, since it is larger than the sum of its proper divisors (9139669765).

111121012091 is a wasteful number, since it uses less digits than its factorization.

111121012091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115558.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 111121012091 in words is "one hundred eleven billion, one hundred twenty-one million, twelve thousand, ninety-one".