12215522 has 8 divisors (see below), whose sum is σ = 19989072. Its totient is φ = 5552500.

The previous prime is 12215477. The next prime is 12215527. The reversal of 12215522 is 22551221.

It is a happy number.

12215522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12215494 and 12215503.

It is not an unprimeable number, because it can be changed into a prime (12215527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277604 + ... + 277647.

It is an arithmetic number, because the mean of its divisors is an integer number (2498634).

Almost surely, 2^12215522 is an apocalyptic number.

12215522 is a deficient number, since it is larger than the sum of its proper divisors (7773550).

12215522 is a wasteful number, since it uses less digits than its factorization.

12215522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555264.

The product of its digits is 400, while the sum is 20.

The square root of 12215522 is about 3495.0711008505. The cubic root of 12215522 is about 230.3053411507.

Adding to 12215522 its reverse (22551221), we get a palindrome (34766743).

The spelling of 12215522 in words is "twelve million, two hundred fifteen thousand, five hundred twenty-two".