321216000 has 320 divisors, whose sum is σ = 1225635840. Its totient is φ = 73113600.

The previous prime is 321215959. The next prime is 321216019. The reversal of 321216000 is 612123.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1343881 + ... + 1344119.

It is an arithmetic number, because the mean of its divisors is an integer number (3830112).

Almost surely, 2^321216000 is an apocalyptic number.

321216000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321216000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (612817920).

321216000 is an abundant number, since it is smaller than the sum of its proper divisors (904419840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321216000 is an equidigital number, since it uses as much as digits as its factorization.

321216000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 321216000 is about 17922.4998256382. The cubic root of 321216000 is about 684.8556713700.

Adding to 321216000 its reverse (612123), we get a palindrome (321828123).

The spelling of 321216000 in words is "three hundred twenty-one million, two hundred sixteen thousand".