321000000 has 196 divisors, whose sum is σ = 1071548784. Its totient is φ = 84800000.

The previous prime is 320999971. The next prime is 321000011. The reversal of 321000000 is 123.

It is a Harshad number since it is a multiple of its sum of digits (6).

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

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2999947 + ... + 3000053.

Almost surely, 2^321000000 is an apocalyptic number.

321000000 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 321000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535774392).

321000000 is an abundant number, since it is smaller than the sum of its proper divisors (750548784).

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

321000000 is an frugal number, since it uses more digits than its factorization.

321000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 321000000 is about 17916.4728671689. The cubic root of 321000000 is about 684.7021277572.

Adding to 321000000 its reverse (123), we get a palindrome (321000123).

The spelling of 321000000 in words is "three hundred twenty-one million", and thus it is an aban number.