13221203212 has 72 divisors (see below), whose sum is σ = 28687809024. Its totient is φ = 5219305728.

The previous prime is 13221203189. The next prime is 13221203213. The reversal of 13221203212 is 21230212231.

It is a self number, because there is not a number n which added to its sum of digits gives 13221203212.

It is not an unprimeable number, because it can be changed into a prime (13221203213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 362943 + ... + 397705.

It is an arithmetic number, because the mean of its divisors is an integer number (398441792).

Almost surely, 2^13221203212 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 13221203212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14343904512).

13221203212 is an abundant number, since it is smaller than the sum of its proper divisors (15466605812).

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

13221203212 is a wasteful number, since it uses less digits than its factorization.

13221203212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34855 (or 34836 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13221203212 its reverse (21230212231), we get a palindrome (34451415443).

The spelling of 13221203212 in words is "thirteen billion, two hundred twenty-one million, two hundred three thousand, two hundred twelve".