3218221685 has 8 divisors (see below), whose sum is σ = 4413561216. Its totient is φ = 2206780560.

The previous prime is 3218221679. The next prime is 3218221687. The reversal of 3218221685 is 5861228123.

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

It is not a de Polignac number, because 3218221685 - 2¹⁸ = 3217959541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218221687) 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, 45974561 + ... + 45974630.

It is an arithmetic number, because the mean of its divisors is an integer number (551695152).

Almost surely, 2^3218221685 is an apocalyptic number.

3218221685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3218221685 is a deficient number, since it is larger than the sum of its proper divisors (1195339531).

3218221685 is an equidigital number, since it uses as much as digits as its factorization.

3218221685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91949203.

The product of its digits is 46080, while the sum is 38.

The square root of 3218221685 is about 56729.3723303898. The cubic root of 3218221685 is about 1476.4043596866.

The spelling of 3218221685 in words is "three billion, two hundred eighteen million, two hundred twenty-one thousand, six hundred eighty-five".