12661224 has 32 divisors (see below), whose sum is σ = 33030720. Its totient is φ = 4036736.

The previous prime is 12661213. The next prime is 12661241. The reversal of 12661224 is 42216621.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a junction number, because it is equal to n+sod(n) for n = 12661194 and 12661203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10917 + ... + 12020.

It is an arithmetic number, because the mean of its divisors is an integer number (1032210).

Almost surely, 2^12661224 is an apocalyptic number.

It is an amenable number.

12661224 is an abundant number, since it is smaller than the sum of its proper divisors (20369496).

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

12661224 is a wasteful number, since it uses less digits than its factorization.

12661224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22969 (or 22965 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 12661224 is about 3558.2613731990. The cubic root of 12661224 is about 233.0729630828.

Adding to 12661224 its reverse (42216621), we get a palindrome (54877845).

The spelling of 12661224 in words is "twelve million, six hundred sixty-one thousand, two hundred twenty-four".