321136002220 has 96 divisors (see below), whose sum is σ = 764886882816. Its totient is φ = 112227878400.

The previous prime is 321136002211. The next prime is 321136002223. The reversal of 321136002220 is 22200631123.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 321136002191 and 321136002200.

It is not an unprimeable number, because it can be changed into a prime (321136002223) 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, 338649 + ... + 870031.

It is an arithmetic number, because the mean of its divisors is an integer number (7967571696).

Almost surely, 2^321136002220 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 321136002220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382443441408).

321136002220 is an abundant number, since it is smaller than the sum of its proper divisors (443750880596).

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

321136002220 is a wasteful number, since it uses less digits than its factorization.

321136002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531511 (or 531509 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 321136002220 its reverse (22200631123), we get a palindrome (343336633343).

The spelling of 321136002220 in words is "three hundred twenty-one billion, one hundred thirty-six million, two thousand, two hundred twenty".