12220522 has 4 divisors (see below), whose sum is σ = 18330786. Its totient is φ = 6110260.

The previous prime is 12220519. The next prime is 12220529. The reversal of 12220522 is 22502221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9126441 + 3094081 = 3021^2 + 1759^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12220496 and 12220505.

It is not an unprimeable number, because it can be changed into a prime (12220529) 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 as a sum of consecutive naturals, namely, 3055129 + ... + 3055132.

Almost surely, 2^12220522 is an apocalyptic number.

12220522 is a deficient number, since it is larger than the sum of its proper divisors (6110264).

12220522 is an equidigital number, since it uses as much as digits as its factorization.

12220522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6110263.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 12220522 is about 3495.7863207010. The cubic root of 12220522 is about 230.3367593640.

Adding to 12220522 its reverse (22502221), we get a palindrome (34722743).

The spelling of 12220522 in words is "twelve million, two hundred twenty thousand, five hundred twenty-two".