404231221 has 4 divisors (see below), whose sum is σ = 407414272. Its totient is φ = 401048172.

The previous prime is 404231209. The next prime is 404231231. The reversal of 404231221 is 122132404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404231221 - 2²⁷ = 270013493 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 (404231231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1591335 + ... + 1591588.

It is an arithmetic number, because the mean of its divisors is an integer number (101853568).

Almost surely, 2^404231221 is an apocalyptic number.

It is an amenable number.

404231221 is a deficient number, since it is larger than the sum of its proper divisors (3183051).

404231221 is a wasteful number, since it uses less digits than its factorization.

404231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183050.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 404231221 is about 20105.5022568450. The cubic root of 404231221 is about 739.3951845272.

Adding to 404231221 its reverse (122132404), we get a palindrome (526363625).

The spelling of 404231221 in words is "four hundred four million, two hundred thirty-one thousand, two hundred twenty-one".