404212221 has 48 divisors (see below), whose sum is σ = 703243200. Its totient is φ = 228777696.

The previous prime is 404212177. The next prime is 404212223. The reversal of 404212221 is 122212404.

It is not a de Polignac number, because 404212221 - 2⁷ = 404212093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404212194 and 404212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404212223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142806 + ... + 145608.

It is an arithmetic number, because the mean of its divisors is an integer number (14650900).

Almost surely, 2^404212221 is an apocalyptic number.

It is an amenable number.

404212221 is a deficient number, since it is larger than the sum of its proper divisors (299030979).

404212221 is a wasteful number, since it uses less digits than its factorization.

404212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935 (or 2922 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 404212221 is about 20105.0297438228. The cubic root of 404212221 is about 739.3835997973.

Adding to 404212221 its reverse (122212404), we get a palindrome (526424625).

The spelling of 404212221 in words is "four hundred four million, two hundred twelve thousand, two hundred twenty-one".