321218985 has 16 divisors (see below), whose sum is σ = 522377280. Its totient is φ = 168507840.

The previous prime is 321218939. The next prime is 321218999. The reversal of 321218985 is 589812123.

It is not a de Polignac number, because 321218985 - 2⁹ = 321218473 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174615 + ... + 176444.

It is an arithmetic number, because the mean of its divisors is an integer number (32648580).

Almost surely, 2^321218985 is an apocalyptic number.

It is an amenable number.

321218985 is a deficient number, since it is larger than the sum of its proper divisors (201158295).

321218985 is a wasteful number, since it uses less digits than its factorization.

321218985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351128.

The product of its digits is 34560, while the sum is 39.

The square root of 321218985 is about 17922.5831006582. The cubic root of 321218985 is about 684.8577927752.

The spelling of 321218985 in words is "three hundred twenty-one million, two hundred eighteen thousand, nine hundred eighty-five".