218334221987 has 8 divisors (see below), whose sum is σ = 249880786272. Its totient is φ = 186876648000.

The previous prime is 218334221983. The next prime is 218334222023. The reversal of 218334221987 is 789122433812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218334221987 - 2² = 218334221983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218334221983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22242314 + ... + 22252127.

It is an arithmetic number, because the mean of its divisors is an integer number (31235098284).

Almost surely, 2^218334221987 is an apocalyptic number.

218334221987 is a deficient number, since it is larger than the sum of its proper divisors (31546564285).

218334221987 is an equidigital number, since it uses as much as digits as its factorization.

218334221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44495149.

The product of its digits is 1161216, while the sum is 50.

The spelling of 218334221987 in words is "two hundred eighteen billion, three hundred thirty-four million, two hundred twenty-one thousand, nine hundred eighty-seven".