404000221 has 16 divisors (see below), whose sum is σ = 428488704. Its totient is φ = 380143984.

The previous prime is 404000213. The next prime is 404000263. The reversal of 404000221 is 122000404.

It is a cyclic number.

It is not a de Polignac number, because 404000221 - 2³ = 404000213 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 (404003221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410496 + ... + 411478.

It is an arithmetic number, because the mean of its divisors is an integer number (26780544).

Almost surely, 2^404000221 is an apocalyptic number.

It is an amenable number.

404000221 is a deficient number, since it is larger than the sum of its proper divisors (24488483).

404000221 is a wasteful number, since it uses less digits than its factorization.

404000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 404000221 is about 20099.7567398215. The cubic root of 404000221 is about 739.2543139693.

Adding to 404000221 its reverse (122000404), we get a palindrome (526000625).

The spelling of 404000221 in words is "four hundred four million, two hundred twenty-one", and thus it is an aban number.