13213220 has 12 divisors (see below), whose sum is σ = 27747804. Its totient is φ = 5285280.

The previous prime is 13213159. The next prime is 13213229. The reversal of 13213220 is 2231231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 4129024 = 3014^2 + 2032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13213195 and 13213204.

It is not an unprimeable number, because it can be changed into a prime (13213229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330311 + ... + 330350.

It is an arithmetic number, because the mean of its divisors is an integer number (2312317).

Almost surely, 2^13213220 is an apocalyptic number.

13213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13213220 is an abundant number, since it is smaller than the sum of its proper divisors (14534584).

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

13213220 is a wasteful number, since it uses less digits than its factorization.

13213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660670 (or 660668 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13213220 is about 3634.9993122420. Note that the first 3 decimals coincide. The cubic root of 13213220 is about 236.4120208461.

Adding to 13213220 its reverse (2231231), we get a palindrome (15444451).

The spelling of 13213220 in words is "thirteen million, two hundred thirteen thousand, two hundred twenty".