404522221 has 4 divisors (see below), whose sum is σ = 415455292. Its totient is φ = 393589152.

The previous prime is 404522219. The next prime is 404522243. The reversal of 404522221 is 122225404.

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 326199721 + 78322500 = 18061^2 + 8850^2 .

It is a cyclic number.

It is not a de Polignac number, because 404522221 - 2¹ = 404522219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404522192 and 404522201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404522201) 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 3 ways as a sum of consecutive naturals, for example, 5466480 + ... + 5466553.

It is an arithmetic number, because the mean of its divisors is an integer number (103863823).

Almost surely, 2^404522221 is an apocalyptic number.

It is an amenable number.

404522221 is a deficient number, since it is larger than the sum of its proper divisors (10933071).

404522221 is a wasteful number, since it uses less digits than its factorization.

404522221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10933070.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 404522221 is about 20112.7377798250. The cubic root of 404522221 is about 739.5725684741.

Adding to 404522221 its reverse (122225404), we get a palindrome (526747625).

The spelling of 404522221 in words is "four hundred four million, five hundred twenty-two thousand, two hundred twenty-one".