404311021 has 8 divisors (see below), whose sum is σ = 418546944. Its totient is φ = 390149760.

The previous prime is 404311007. The next prime is 404311067. The reversal of 404311021 is 120113404.

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 404311021 - 2⁹ = 404310509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404310986 and 404311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404311091) 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, 7531 + ... + 29416.

It is an arithmetic number, because the mean of its divisors is an integer number (52318368).

Almost surely, 2^404311021 is an apocalyptic number.

It is an amenable number.

404311021 is a deficient number, since it is larger than the sum of its proper divisors (14235923).

404311021 is a wasteful number, since it uses less digits than its factorization.

404311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37331.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 404311021 is about 20107.4866902853. The cubic root of 404311021 is about 739.4438364294.

Adding to 404311021 its reverse (120113404), we get a palindrome (524424425).

The spelling of 404311021 in words is "four hundred four million, three hundred eleven thousand, twenty-one".