321201321020 has 48 divisors (see below), whose sum is σ = 694298787840. Its totient is φ = 124756720704.

The previous prime is 321201320959. The next prime is 321201321029. The reversal of 321201321020 is 20123102123.

It is a self number, because there is not a number n which added to its sum of digits gives 321201321020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321201321029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1225910 + ... + 1464669.

It is an arithmetic number, because the mean of its divisors is an integer number (14464558080).

Almost surely, 2^321201321020 is an apocalyptic number.

It is an amenable number.

321201321020 is an abundant number, since it is smaller than the sum of its proper divisors (373097466820).

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

321201321020 is a wasteful number, since it uses less digits than its factorization.

321201321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690762 (or 2690760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 321201321020 its reverse (20123102123), we get a palindrome (341324423143).

The spelling of 321201321020 in words is "three hundred twenty-one billion, two hundred one million, three hundred twenty-one thousand, twenty".