321440143344340 has 24 divisors (see below), whose sum is σ = 675050626020960. Its totient is φ = 128571043052448.

The previous prime is 321440143344283. The next prime is 321440143344373. The reversal of 321440143344340 is 43443341044123.

It is a junction number, because it is equal to n+sod(n) for n = 321440143344293 and 321440143344302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312867150 + ... + 313892869.

It is an arithmetic number, because the mean of its divisors is an integer number (28127109417540).

Almost surely, 2^{321440143344340} is an apocalyptic number.

It is an amenable number.

321440143344340 is an abundant number, since it is smaller than the sum of its proper divisors (353610482676620).

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

321440143344340 is a wasteful number, since it uses less digits than its factorization.

321440143344340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626785671 (or 626785669 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 40.

Adding to 321440143344340 its reverse (43443341044123), we get a palindrome (364883484388463).

The spelling of 321440143344340 in words is "three hundred twenty-one trillion, four hundred forty billion, one hundred forty-three million, three hundred forty-four thousand, three hundred forty".