15216222 has 16 divisors (see below), whose sum is σ = 34780032. Its totient is φ = 4347480.

The previous prime is 15216221. The next prime is 15216233. The reversal of 15216222 is 22261251.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15216221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181104 + ... + 181187.

It is an arithmetic number, because the mean of its divisors is an integer number (2173752).

Almost surely, 2^15216222 is an apocalyptic number.

15216222 is an abundant number, since it is smaller than the sum of its proper divisors (19563810).

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

15216222 is a wasteful number, since it uses less digits than its factorization.

15216222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362303.

The product of its digits is 480, while the sum is 21.

The square root of 15216222 is about 3900.7976107458. The cubic root of 15216222 is about 247.8005572187.

Adding to 15216222 its reverse (22261251), we get a palindrome (37477473).

The spelling of 15216222 in words is "fifteen million, two hundred sixteen thousand, two hundred twenty-two".