321521252442 has 64 divisors (see below), whose sum is σ = 698811563520. Its totient is φ = 98616253632.

The previous prime is 321521252441. The next prime is 321521252453. The reversal of 321521252442 is 244252125123.

It is not an unprimeable number, because it can be changed into a prime (321521252441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4140223 + ... + 4217165.

It is an arithmetic number, because the mean of its divisors is an integer number (10918930680).

Almost surely, 2^321521252442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321521252442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349405781760).

321521252442 is an abundant number, since it is smaller than the sum of its proper divisors (377290311078).

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

321521252442 is a wasteful number, since it uses less digits than its factorization.

321521252442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77304 (or 77278 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

Adding to 321521252442 its reverse (244252125123), we get a palindrome (565773377565).

The spelling of 321521252442 in words is "three hundred twenty-one billion, five hundred twenty-one million, two hundred fifty-two thousand, four hundred forty-two".