404130221 has 16 divisors (see below), whose sum is σ = 447249600. Its totient is φ = 362102400.

The previous prime is 404130203. The next prime is 404130257. The reversal of 404130221 is 122031404.

404130221 = 88² + 89² + ... + 1066².

It is not a de Polignac number, because 404130221 - 2⁶ = 404130157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 404130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404130521) 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 15 ways as a sum of consecutive naturals, for example, 497906 + ... + 498716.

It is an arithmetic number, because the mean of its divisors is an integer number (27953100).

Almost surely, 2^404130221 is an apocalyptic number.

It is an amenable number.

404130221 is a deficient number, since it is larger than the sum of its proper divisors (43119379).

404130221 is a wasteful number, since it uses less digits than its factorization.

404130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 404130221 is about 20102.9903496967. The cubic root of 404130221 is about 739.3335983769. Note that the first 3 decimals are identical.

Adding to 404130221 its reverse (122031404), we get a palindrome (526161625).

The spelling of 404130221 in words is "four hundred four million, one hundred thirty thousand, two hundred twenty-one".