321600391040 has 32 divisors (see below), whose sum is σ = 768825936360. Its totient is φ = 128640156160.

The previous prime is 321600391009. The next prime is 321600391051. The reversal of 321600391040 is 40193006123.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 321600390994 and 321600391012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251249666 + ... + 251250945.

Almost surely, 2^321600391040 is an apocalyptic number.

It is an amenable number.

321600391040 is an abundant number, since it is smaller than the sum of its proper divisors (447225545320).

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

321600391040 is an equidigital number, since it uses as much as digits as its factorization.

321600391040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502500630 (or 502500618 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

Adding to 321600391040 its reverse (40193006123), we get a palindrome (361793397163).

The spelling of 321600391040 in words is "three hundred twenty-one billion, six hundred million, three hundred ninety-one thousand, forty".