321000120 has 384 divisors, whose sum is σ = 1293926400. Its totient is φ = 67350528.

The previous prime is 321000091. The next prime is 321000131. The reversal of 321000120 is 21000123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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 95 ways as a sum of consecutive naturals, for example, 2527497 + ... + 2527623.

It is an arithmetic number, because the mean of its divisors is an integer number (3369600).

Almost surely, 2^321000120 is an apocalyptic number.

321000120 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 321000120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646963200).

321000120 is an abundant number, since it is smaller than the sum of its proper divisors (972926280).

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

321000120 is a wasteful number, since it uses less digits than its factorization.

321000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 321000120 is about 17916.4762160420. The cubic root of 321000120 is about 684.7022130784.

Adding to 321000120 its reverse (21000123), we get a palindrome (342000243).

The spelling of 321000120 in words is "three hundred twenty-one million, one hundred twenty", and thus it is an aban number.