13122231220 has 96 divisors (see below), whose sum is σ = 32548594176. Its totient is φ = 4350259200.

The previous prime is 13122231191. The next prime is 13122231229. The reversal of 13122231220 is 2213222131.

13122231220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13122231220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13122231229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 638505 + ... + 658735.

It is an arithmetic number, because the mean of its divisors is an integer number (339047856).

Almost surely, 2^13122231220 is an apocalyptic number.

13122231220 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 13122231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16274297088).

13122231220 is an abundant number, since it is smaller than the sum of its proper divisors (19426362956).

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

13122231220 is a wasteful number, since it uses less digits than its factorization.

13122231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20401 (or 20399 counting only the distinct ones).

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

Adding to 13122231220 its reverse (2213222131), we get a palindrome (15335453351).

The spelling of 13122231220 in words is "thirteen billion, one hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty".