13220321220 has 72 divisors (see below), whose sum is σ = 42212264640. Its totient is φ = 3339869760.

The previous prime is 13220321173. The next prime is 13220321221. The reversal of 13220321220 is 2212302231.

13220321220 is a `hidden beast` number, since 1 + 322 + 0 + 321 + 2 + 20 = 666.

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 = 13220321193 and 13220321202.

It is not an unprimeable number, because it can be changed into a prime (13220321221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1929376 + ... + 1936215.

Almost surely, 2^13220321220 is an apocalyptic number.

13220321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13220321220 is an abundant number, since it is smaller than the sum of its proper divisors (28991943420).

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

13220321220 is a wasteful number, since it uses less digits than its factorization.

13220321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865625 (or 3865620 counting only the distinct ones).

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

Adding to 13220321220 its reverse (2212302231), we get a palindrome (15432623451).

The spelling of 13220321220 in words is "thirteen billion, two hundred twenty million, three hundred twenty-one thousand, two hundred twenty".