404333021 has 4 divisors (see below), whose sum is σ = 414194844. Its totient is φ = 394471200.

The previous prime is 404333009. The next prime is 404333047. The reversal of 404333021 is 120333404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56100100 + 348232921 = 7490^2 + 18661^2 .

It is a cyclic number.

It is not a de Polignac number, because 404333021 - 2¹⁰ = 404331997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404332984 and 404333002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404333221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4930850 + ... + 4930931.

It is an arithmetic number, because the mean of its divisors is an integer number (103548711).

Almost surely, 2^404333021 is an apocalyptic number.

404333021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

404333021 is a deficient number, since it is larger than the sum of its proper divisors (9861823).

404333021 is an equidigital number, since it uses as much as digits as its factorization.

404333021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9861822.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 404333021 is about 20108.0337427606. The cubic root of 404333021 is about 739.4572481088.

Adding to 404333021 its reverse (120333404), we get a palindrome (524666425).

The spelling of 404333021 in words is "four hundred four million, three hundred thirty-three thousand, twenty-one".