111102121987 has 4 divisors (see below), whose sum is σ = 111136091056. Its totient is φ = 111068152920.

The previous prime is 111102121979. The next prime is 111102122011. The reversal of 111102121987 is 789121201111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789121201111 = 17 ⋅46418894183.

It is a cyclic number.

It is not a de Polignac number, because 111102121987 - 2³ = 111102121979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111102121087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16979628 + ... + 16986169.

It is an arithmetic number, because the mean of its divisors is an integer number (27784022764).

Almost surely, 2^111102121987 is an apocalyptic number.

111102121987 is a deficient number, since it is larger than the sum of its proper divisors (33969069).

111102121987 is an equidigital number, since it uses as much as digits as its factorization.

111102121987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33969068.

The product of its (nonzero) digits is 2016, while the sum is 34.

The spelling of 111102121987 in words is "one hundred eleven billion, one hundred two million, one hundred twenty-one thousand, nine hundred eighty-seven".