111045212891 has 4 divisors (see below), whose sum is σ = 116889697800. Its totient is φ = 105200727984.

The previous prime is 111045212867. The next prime is 111045212903. The reversal of 111045212891 is 198212540111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198212540111 = 17 ⋅11659561183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111045212891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111045212591) 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, 2922242426 + ... + 2922242463.

It is an arithmetic number, because the mean of its divisors is an integer number (29222424450).

Almost surely, 2^111045212891 is an apocalyptic number.

111045212891 is a deficient number, since it is larger than the sum of its proper divisors (5844484909).

111045212891 is an equidigital number, since it uses as much as digits as its factorization.

111045212891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5844484908.

The product of its (nonzero) digits is 5760, while the sum is 35.

The spelling of 111045212891 in words is "one hundred eleven billion, forty-five million, two hundred twelve thousand, eight hundred ninety-one".