404003221 has 2 divisors, whose sum is σ = 404003222. Its totient is φ = 404003220.

The previous prime is 404003207. The next prime is 404003231. The reversal of 404003221 is 122300404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327248100 + 76755121 = 18090^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 404003221 - 2¹⁵ = 403970453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404003195 and 404003204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404003231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202001610 + 202001611.

It is an arithmetic number, because the mean of its divisors is an integer number (202001611).

Almost surely, 2^404003221 is an apocalyptic number.

It is an amenable number.

404003221 is a deficient number, since it is larger than the sum of its proper divisors (1).

404003221 is an equidigital number, since it uses as much as digits as its factorization.

404003221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 404003221 is about 20099.8313674518. The cubic root of 404003221 is about 739.2561438012.

Adding to 404003221 its reverse (122300404), we get a palindrome (526303625).

The spelling of 404003221 in words is "four hundred four million, three thousand, two hundred twenty-one".