12213712 has 40 divisors (see below), whose sum is σ = 27248256. Its totient is φ = 5195136.

The previous prime is 12213689. The next prime is 12213731. The reversal of 12213712 is 21731221.

It is a self number, because there is not a number n which added to its sum of digits gives 12213712.

It is a congruent number.

It is an unprimeable number.

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, 18378 + ... + 19030.

Almost surely, 2^12213712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12213712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13624128).

12213712 is an abundant number, since it is smaller than the sum of its proper divisors (15034544).

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

12213712 is a wasteful number, since it uses less digits than its factorization.

12213712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 829 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 12213712 is about 3494.8121551809. The cubic root of 12213712 is about 230.2939656439.

Adding to 12213712 its reverse (21731221), we get a palindrome (33944933).

The spelling of 12213712 in words is "twelve million, two hundred thirteen thousand, seven hundred twelve".