111220211987 has 8 divisors (see below), whose sum is σ = 118281359376. Its totient is φ = 104216707072.

The previous prime is 111220211981. The next prime is 111220212013. The reversal of 111220211987 is 789112022111.

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 111220211987 - 2⁶ = 111220211923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111220211981) 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 7 ways as a sum of consecutive naturals, for example, 14406638 + ... + 14414355.

It is an arithmetic number, because the mean of its divisors is an integer number (14785169922).

Almost surely, 2^111220211987 is an apocalyptic number.

111220211987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

111220211987 is a deficient number, since it is larger than the sum of its proper divisors (7061147389).

111220211987 is a wasteful number, since it uses less digits than its factorization.

111220211987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28821237.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 111220211987 in words is "one hundred eleven billion, two hundred twenty million, two hundred eleven thousand, nine hundred eighty-seven".