13211220 has 96 divisors (see below), whose sum is σ = 41521536. Its totient is φ = 3110400.

The previous prime is 13211207. The next prime is 13211243. The reversal of 13211220 is 2211231.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 13211196 and 13211205.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 24150 + ... + 24690.

It is an arithmetic number, because the mean of its divisors is an integer number (432516).

Almost surely, 2^13211220 is an apocalyptic number.

13211220 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 13211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20760768).

13211220 is an abundant number, since it is smaller than the sum of its proper divisors (28310316).

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

13211220 is a wasteful number, since it uses less digits than its factorization.

13211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 13211220 is about 3634.7241986154. The cubic root of 13211220 is about 236.4000921893.

Adding to 13211220 its reverse (2211231), we get a palindrome (15422451).

It can be divided in two parts, 13211 and 220, that added together give a palindrome (13431).

The spelling of 13211220 in words is "thirteen million, two hundred eleven thousand, two hundred twenty".