321244140 has 96 divisors (see below), whose sum is σ = 1033966080. Its totient is φ = 72999936.

The previous prime is 321244139. The next prime is 321244159. The reversal of 321244140 is 41442123.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73044 + ... + 77316.

It is an arithmetic number, because the mean of its divisors is an integer number (10770480).

Almost surely, 2^321244140 is an apocalyptic number.

321244140 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 321244140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516983040).

321244140 is an abundant number, since it is smaller than the sum of its proper divisors (712721940).

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

321244140 is a wasteful number, since it uses less digits than its factorization.

321244140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471 (or 4469 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 321244140 is about 17923.2848551821. The cubic root of 321244140 is about 684.8756696224.

Adding to 321244140 its reverse (41442123), we get a palindrome (362686263).

It can be divided in two parts, 321 and 244140, that multiplied together give a triangular number (78368940 = T₁₂₅₁₉).

The spelling of 321244140 in words is "three hundred twenty-one million, two hundred forty-four thousand, one hundred forty".