404021121 has 12 divisors (see below), whose sum is σ = 626645232. Its totient is φ = 230869128.

The previous prime is 404021119. The next prime is 404021129. The reversal of 404021121 is 121120404.

It is not a de Polignac number, because 404021121 - 2¹ = 404021119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404021121.

It is not an unprimeable number, because it can be changed into a prime (404021129) 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 11 ways as a sum of consecutive naturals, for example, 1374075 + ... + 1374368.

It is an arithmetic number, because the mean of its divisors is an integer number (52220436).

Almost surely, 2^404021121 is an apocalyptic number.

It is an amenable number.

404021121 is a deficient number, since it is larger than the sum of its proper divisors (222624111).

404021121 is a wasteful number, since it uses less digits than its factorization.

404021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748460 (or 2748453 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 404021121 is about 20100.2766398873. The cubic root of 404021121 is about 739.2670616098.

Adding to 404021121 its reverse (121120404), we get a palindrome (525141525).

The spelling of 404021121 in words is "four hundred four million, twenty-one thousand, one hundred twenty-one".