12225421 has 8 divisors (see below), whose sum is σ = 13487544. Its totient is φ = 11009280.

The previous prime is 12225407. The next prime is 12225427. The reversal of 12225421 is 12452221.

It can be written as a sum of positive squares in 4 ways, for example, as 570025 + 11655396 = 755^2 + 3414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12225421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12225427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10936 + ... + 12001.

It is an arithmetic number, because the mean of its divisors is an integer number (1685943).

Almost surely, 2^12225421 is an apocalyptic number.

It is an amenable number.

12225421 is a deficient number, since it is larger than the sum of its proper divisors (1262123).

12225421 is a wasteful number, since it uses less digits than its factorization.

12225421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22991.

The product of its digits is 320, while the sum is 19.

The square root of 12225421 is about 3496.4869512126. The cubic root of 12225421 is about 230.3675346187.

Adding to 12225421 its reverse (12452221), we get a palindrome (24677642).

The spelling of 12225421 in words is "twelve million, two hundred twenty-five thousand, four hundred twenty-one".