13521222 has 128 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 3525120.

The previous prime is 13521197. The next prime is 13521253. The reversal of 13521222 is 22212531.

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 = 13521195 and 13521204.

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 63 ways as a sum of consecutive naturals, for example, 131223 + ... + 131325.

It is an arithmetic number, because the mean of its divisors is an integer number (294840).

Almost surely, 2^13521222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13521222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18869760).

13521222 is an abundant number, since it is smaller than the sum of its proper divisors (24218298).

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

13521222 is a wasteful number, since it uses less digits than its factorization.

13521222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 149 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 13521222 is about 3677.1214285090. The cubic root of 13521222 is about 238.2348621956.

Adding to 13521222 its reverse (22212531), we get a palindrome (35733753).

The spelling of 13521222 in words is "thirteen million, five hundred twenty-one thousand, two hundred twenty-two".