404121221 has 8 divisors (see below), whose sum is σ = 466337664. Its totient is φ = 343026000.

The previous prime is 404121217. The next prime is 404121251. The reversal of 404121221 is 122121404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404121221 - 2² = 404121217 is a prime.

It is a super-2 number, since 2×404121221² = 326627922525061682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404121251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279530 + ... + 280971.

It is an arithmetic number, because the mean of its divisors is an integer number (58292208).

Almost surely, 2^404121221 is an apocalyptic number.

It is an amenable number.

404121221 is a deficient number, since it is larger than the sum of its proper divisors (62216443).

404121221 is a wasteful number, since it uses less digits than its factorization.

404121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560611.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 404121221 is about 20102.7665011560. The cubic root of 404121221 is about 739.3281100043.

Adding to 404121221 its reverse (122121404), we get a palindrome (526242625).

The spelling of 404121221 in words is "four hundred four million, one hundred twenty-one thousand, two hundred twenty-one".