404222221 has 4 divisors (see below), whose sum is σ = 435316252. Its totient is φ = 373128192.

The previous prime is 404222219. The next prime is 404222251. The reversal of 404222221 is 122222404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229189321 + 175032900 = 15139^2 + 13230^2 .

It is a cyclic number.

It is not a de Polignac number, because 404222221 - 2¹ = 404222219 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 (404222251) 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, 15546996 + ... + 15547021.

It is an arithmetic number, because the mean of its divisors is an integer number (108829063).

Almost surely, 2^404222221 is an apocalyptic number.

It is an amenable number.

404222221 is a deficient number, since it is larger than the sum of its proper divisors (31094031).

404222221 is a wasteful number, since it uses less digits than its factorization.

404222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31094030.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 404222221 is about 20105.2784362714. The cubic root of 404222221 is about 739.3896970688.

Adding to 404222221 its reverse (122222404), we get a palindrome (526444625).

The spelling of 404222221 in words is "four hundred four million, two hundred twenty-two thousand, two hundred twenty-one".