12212546 has 4 divisors (see below), whose sum is σ = 18318822. Its totient is φ = 6106272.

The previous prime is 12212539. The next prime is 12212549. The reversal of 12212546 is 64521221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64521221 = 1129 ⋅57149.

It can be written as a sum of positive squares in only one way, i.e., 7756225 + 4456321 = 2785^2 + 2111^2 .

It is not an unprimeable number, because it can be changed into a prime (12212549) by changing a digit.

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 as a sum of consecutive naturals, namely, 3053135 + ... + 3053138.

Almost surely, 2^12212546 is an apocalyptic number.

12212546 is a deficient number, since it is larger than the sum of its proper divisors (6106276).

12212546 is an equidigital number, since it uses as much as digits as its factorization.

12212546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6106275.

The product of its digits is 960, while the sum is 23.

The square root of 12212546 is about 3494.6453325051. The cubic root of 12212546 is about 230.2866369599.

Adding to 12212546 its reverse (64521221), we get a palindrome (76733767).

It can be divided in two parts, 12 and 212546, that multiplied together give a palindrome (2550552).

The spelling of 12212546 in words is "twelve million, two hundred twelve thousand, five hundred forty-six".