12220321320 has 48 divisors (see below), whose sum is σ = 39716045460. Its totient is φ = 3258752256.

The previous prime is 12220321313. The next prime is 12220321343. The reversal of 12220321320 is 2312302221.

12220321320 is a `hidden beast` number, since 1 + 2 + 2 + 20 + 321 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12086363844 + 133957476 = 109938^2 + 11574^2 .

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 = 12220321293 and 12220321302.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16972309 + ... + 16973028.

Almost surely, 2^12220321320 is an apocalyptic number.

12220321320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12220321320 is an abundant number, since it is smaller than the sum of its proper divisors (27495724140).

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

12220321320 is a wasteful number, since it uses less digits than its factorization.

12220321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33945354 (or 33945347 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 12220321320 its reverse (2312302221), we get a palindrome (14532623541).

The spelling of 12220321320 in words is "twelve billion, two hundred twenty million, three hundred twenty-one thousand, three hundred twenty".