12213544 has 32 divisors (see below), whose sum is σ = 26712000. Its totient is φ = 5233200.

The previous prime is 12213541. The next prime is 12213571. The reversal of 12213544 is 44531221.

12213544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12213541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519 + ... + 4969.

It is an arithmetic number, because the mean of its divisors is an integer number (834750).

Almost surely, 2^12213544 is an apocalyptic number.

12213544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12213544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13356000).

12213544 is an abundant number, since it is smaller than the sum of its proper divisors (14498456).

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

12213544 is an equidigital number, since it uses as much as digits as its factorization.

12213544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478 (or 4460 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 12213544 is about 3494.7881194716. The cubic root of 12213544 is about 230.2929097388.

Adding to 12213544 its reverse (44531221), we get a palindrome (56744765).

The spelling of 12213544 in words is "twelve million, two hundred thirteen thousand, five hundred forty-four".