12221436 has 48 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 3797760.

The previous prime is 12221431. The next prime is 12221449. The reversal of 12221436 is 63412221.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28141 + ... + 28571.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^12221436 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 12221436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15240960).

12221436 is an abundant number, since it is smaller than the sum of its proper divisors (18260484).

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

12221436 is a wasteful number, since it uses less digits than its factorization.

12221436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 592 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 12221436 is about 3495.9170470708. The cubic root of 12221436 is about 230.3425016869.

Adding to 12221436 its reverse (63412221), we get a palindrome (75633657).

The spelling of 12221436 in words is "twelve million, two hundred twenty-one thousand, four hundred thirty-six".