321331120020 has 72 divisors (see below), whose sum is σ = 975498156360. Its totient is φ = 85618517760.

The previous prime is 321331119997. The next prime is 321331120039. The reversal of 321331120020 is 20021133123.

321331120020 is a `hidden beast` number, since 321 + 331 + 12 + 0 + 0 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 178533291024 + 142797828996 = 422532^2 + 377886^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 321331119975 and 321331120002.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 505051 + ... + 947490.

It is an arithmetic number, because the mean of its divisors is an integer number (13548585505).

Almost surely, 2^321331120020 is an apocalyptic number.

321331120020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

321331120020 is an abundant number, since it is smaller than the sum of its proper divisors (654167036340).

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

321331120020 is a wasteful number, since it uses less digits than its factorization.

321331120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453785 (or 1453780 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 321331120020 its reverse (20021133123), we get a palindrome (341352253143).

The spelling of 321331120020 in words is "three hundred twenty-one billion, three hundred thirty-one million, one hundred twenty thousand, twenty".