12621224 has 48 divisors (see below), whose sum is σ = 30041280. Its totient is φ = 4915680.

The previous prime is 12621197. The next prime is 12621241. The reversal of 12621224 is 42212621.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12621196 and 12621205.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2849 + ... + 5775.

It is an arithmetic number, because the mean of its divisors is an integer number (625860).

Almost surely, 2^12621224 is an apocalyptic number.

12621224 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 12621224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15020640).

12621224 is an abundant number, since it is smaller than the sum of its proper divisors (17420056).

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

12621224 is a wasteful number, since it uses less digits than its factorization.

12621224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958 (or 2947 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 12621224 is about 3552.6362042855. The cubic root of 12621224 is about 232.8272587284.

Adding to 12621224 its reverse (42212621), we get a palindrome (54833845).

The spelling of 12621224 in words is "twelve million, six hundred twenty-one thousand, two hundred twenty-four".