12404221 has 8 divisors (see below), whose sum is σ = 12579840. Its totient is φ = 12230112.

The previous prime is 12404201. The next prime is 12404269. The reversal of 12404221 is 12240421.

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

It is a cyclic number.

It is not a de Polignac number, because 12404221 - 2¹³ = 12396029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12404195 and 12404204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12404201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32196 + ... + 32578.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^12404221 is an apocalyptic number.

It is an amenable number.

12404221 is a deficient number, since it is larger than the sum of its proper divisors (175619).

12404221 is a wasteful number, since it uses less digits than its factorization.

12404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12404221 is about 3521.9626630616. The cubic root of 12404221 is about 231.4851655925.

Adding to 12404221 its reverse (12240421), we get a palindrome (24644642).

The spelling of 12404221 in words is "twelve million, four hundred four thousand, two hundred twenty-one".