13221222 has 32 divisors (see below), whose sum is σ = 30331392. Its totient is φ = 3763584.

The previous prime is 13221209. The next prime is 13221227. The reversal of 13221222 is 22212231.

It is a happy number.

It is a super-2 number, since 2×13221222² = 349601422346568, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17823 + ... + 18549.

It is an arithmetic number, because the mean of its divisors is an integer number (947856).

Almost surely, 2^13221222 is an apocalyptic number.

13221222 is an abundant number, since it is smaller than the sum of its proper divisors (17110170).

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

13221222 is a wasteful number, since it uses less digits than its factorization.

13221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172.

The product of its digits is 96, while the sum is 15.

The square root of 13221222 is about 3636.0998336129. The cubic root of 13221222 is about 236.4597353631.

Adding to 13221222 its reverse (22212231), we get a palindrome (35433453).

It can be divided in two parts, 1 and 3221222, that added together give a palindrome (3221223).

The spelling of 13221222 in words is "thirteen million, two hundred twenty-one thousand, two hundred twenty-two".