13221201220 has 24 divisors (see below), whose sum is σ = 27767585664. Its totient is φ = 5287897056.

The previous prime is 13221201209. The next prime is 13221201221. The reversal of 13221201220 is 2210212231.

It is a happy number.

It is a super-3 number, since 3×13221201220³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13221201194 and 13221201203.

It is not an unprimeable number, because it can be changed into a prime (13221201221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180979 + ... + 243301.

It is an arithmetic number, because the mean of its divisors is an integer number (1156982736).

Almost surely, 2^13221201220 is an apocalyptic number.

13221201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13221201220 is an abundant number, since it is smaller than the sum of its proper divisors (14546384444).

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

13221201220 is a wasteful number, since it uses less digits than its factorization.

13221201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72939 (or 72937 counting only the distinct ones).

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

Adding to 13221201220 its reverse (2210212231), we get a palindrome (15431413451).

The spelling of 13221201220 in words is "thirteen billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty".