111212201987 has 4 divisors (see below), whose sum is σ = 111249738600. Its totient is φ = 111174665376.

The previous prime is 111212201983. The next prime is 111212202037. The reversal of 111212201987 is 789102212111.

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 111212201987 - 2² = 111212201983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111212201983) 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, 18763862 + ... + 18769787.

It is an arithmetic number, because the mean of its divisors is an integer number (27812434650).

Almost surely, 2^111212201987 is an apocalyptic number.

111212201987 is a deficient number, since it is larger than the sum of its proper divisors (37536613).

111212201987 is an equidigital number, since it uses as much as digits as its factorization.

111212201987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37536612.

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

The spelling of 111212201987 in words is "one hundred eleven billion, two hundred twelve million, two hundred one thousand, nine hundred eighty-seven".