321231240 has 96 divisors (see below), whose sum is σ = 1138924800. Its totient is φ = 77873280.

The previous prime is 321231221. The next prime is 321231329. The reversal of 321231240 is 42132123.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36600 + ... + 44519.

It is an arithmetic number, because the mean of its divisors is an integer number (11863800).

Almost surely, 2^321231240 is an apocalyptic number.

321231240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

321231240 is an abundant number, since it is smaller than the sum of its proper divisors (817693560).

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

321231240 is a wasteful number, since it uses less digits than its factorization.

321231240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81147 (or 81140 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 321231240 is about 17922.9249844996. The cubic root of 321231240 is about 684.8665021250.

Adding to 321231240 its reverse (42132123), we get a palindrome (363363363).

The spelling of 321231240 in words is "three hundred twenty-one million, two hundred thirty-one thousand, two hundred forty".