13201221220 has 96 divisors (see below), whose sum is σ = 31637765376. Its totient is φ = 4580083200.

The previous prime is 13201221179. The next prime is 13201221263. The reversal of 13201221220 is 2212210231.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13201221194 and 13201221203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2127162 + ... + 2133358.

It is an arithmetic number, because the mean of its divisors is an integer number (329560056).

Almost surely, 2^13201221220 is an apocalyptic number.

13201221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13201221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15818882688).

13201221220 is an abundant number, since it is smaller than the sum of its proper divisors (18436544156).

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

13201221220 is a wasteful number, since it uses less digits than its factorization.

13201221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661 (or 6659 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 13201221220 its reverse (2212210231), we get a palindrome (15413431451).

The spelling of 13201221220 in words is "thirteen billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty".