404513221 has 16 divisors (see below), whose sum is σ = 469759104. Its totient is φ = 341155584.

The previous prime is 404513201. The next prime is 404513233. The reversal of 404513221 is 122315404.

It is not a de Polignac number, because 404513221 - 2⁵ = 404513189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404513192 and 404513201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404513201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314646 + ... + 315928.

It is an arithmetic number, because the mean of its divisors is an integer number (29359944).

Almost surely, 2^404513221 is an apocalyptic number.

It is an amenable number.

404513221 is a deficient number, since it is larger than the sum of its proper divisors (65245883).

404513221 is a wasteful number, since it uses less digits than its factorization.

404513221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 404513221 is about 20112.5140397714. The cubic root of 404513221 is about 739.5670836476.

Adding to 404513221 its reverse (122315404), we get a palindrome (526828625).

The spelling of 404513221 in words is "four hundred four million, five hundred thirteen thousand, two hundred twenty-one".