321131320120 has 128 divisors (see below), whose sum is σ = 787726296000. Its totient is φ = 117111582720.

The previous prime is 321131320049. The next prime is 321131320127. The reversal of 321131320120 is 21023131123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321131320127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49470075 + ... + 49476565.

Almost surely, 2^321131320120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321131320120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393863148000).

321131320120 is an abundant number, since it is smaller than the sum of its proper divisors (466594975880).

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

321131320120 is a wasteful number, since it uses less digits than its factorization.

321131320120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7673 (or 7669 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 321131320120 its reverse (21023131123), we get a palindrome (342154451243).

The spelling of 321131320120 in words is "three hundred twenty-one billion, one hundred thirty-one million, three hundred twenty thousand, one hundred twenty".