12213144 has 24 divisors (see below), whose sum is σ = 33077460. Its totient is φ = 4071024.

The previous prime is 12213137. The next prime is 12213167. The reversal of 12213144 is 44131221.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

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 5 ways as a sum of consecutive naturals, for example, 84742 + ... + 84885.

Almost surely, 2^12213144 is an apocalyptic number.

It is an amenable number.

12213144 is an abundant number, since it is smaller than the sum of its proper divisors (20864316).

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

12213144 is a wasteful number, since it uses less digits than its factorization.

12213144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169639 (or 169632 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 12213144 is about 3494.7308909271. The cubic root of 12213144 is about 230.2903956400.

Adding to 12213144 its reverse (44131221), we get a palindrome (56344365).

The spelling of 12213144 in words is "twelve million, two hundred thirteen thousand, one hundred forty-four".