12211224 has 64 divisors (see below), whose sum is σ = 32736000. Its totient is φ = 3784320.

The previous prime is 12211223. The next prime is 12211231. The reversal of 12211224 is 42211221.

It is a super-2 number, since 2×12211224² = 298227983156352, which contains 22 as substring.

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 (12211223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27597 + ... + 28035.

It is an arithmetic number, because the mean of its divisors is an integer number (511500).

Almost surely, 2^12211224 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 12211224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16368000).

12211224 is an abundant number, since it is smaller than the sum of its proper divisors (20524776).

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

12211224 is a wasteful number, since it uses less digits than its factorization.

12211224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 524 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 12211224 is about 3494.4561808671. The cubic root of 12211224 is about 230.2783272015.

Adding to 12211224 its reverse (42211221), we get a palindrome (54422445).

The spelling of 12211224 in words is "twelve million, two hundred eleven thousand, two hundred twenty-four".