404120221 has 4 divisors (see below), whose sum is σ = 405108700. Its totient is φ = 403131744.

The previous prime is 404120219. The next prime is 404120239. The reversal of 404120221 is 122021404.

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 248220025 + 155900196 = 15755^2 + 12486^2 .

It is a cyclic number.

It is not a de Polignac number, because 404120221 - 2¹ = 404120219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404120195 and 404120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404120201) 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, 493626 + ... + 494443.

It is an arithmetic number, because the mean of its divisors is an integer number (101277175).

Almost surely, 2^404120221 is an apocalyptic number.

It is an amenable number.

404120221 is a deficient number, since it is larger than the sum of its proper divisors (988479).

404120221 is an equidigital number, since it uses as much as digits as its factorization.

404120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988478.

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

The square root of 404120221 is about 20102.7416289421. The cubic root of 404120221 is about 739.3275001801.

Adding to 404120221 its reverse (122021404), we get a palindrome (526141625).

The spelling of 404120221 in words is "four hundred four million, one hundred twenty thousand, two hundred twenty-one".