404555120221 has 16 divisors (see below), whose sum is σ = 490676344704. Its totient is φ = 325610025984.

The previous prime is 404555120213. The next prime is 404555120227. The reversal of 404555120221 is 122021555404.

It is a cyclic number.

It is not a de Polignac number, because 404555120221 - 2³ = 404555120213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404555120227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3874135 + ... + 3977188.

It is an arithmetic number, because the mean of its divisors is an integer number (30667271544).

Almost surely, 2^404555120221 is an apocalyptic number.

It is an amenable number.

404555120221 is a deficient number, since it is larger than the sum of its proper divisors (86121224483).

404555120221 is a wasteful number, since it uses less digits than its factorization.

404555120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7851780.

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 404555120221 its reverse (122021555404), we get a palindrome (526576675625).

The spelling of 404555120221 in words is "four hundred four billion, five hundred fifty-five million, one hundred twenty thousand, two hundred twenty-one".