404332021 has 2 divisors, whose sum is σ = 404332022. Its totient is φ = 404332020.

The previous prime is 404332013. The next prime is 404332031. The reversal of 404332021 is 120233404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283551921 + 120780100 = 16839^2 + 10990^2 .

It is a cyclic number.

It is not a de Polignac number, because 404332021 - 2³ = 404332013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404332021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404332001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202166010 + 202166011.

It is an arithmetic number, because the mean of its divisors is an integer number (202166011).

Almost surely, 2^404332021 is an apocalyptic number.

It is an amenable number.

404332021 is a deficient number, since it is larger than the sum of its proper divisors (1).

404332021 is an equidigital number, since it uses as much as digits as its factorization.

404332021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 404332021 is about 20108.0088770619. The cubic root of 404332021 is about 739.4566384976.

Adding to 404332021 its reverse (120233404), we get a palindrome (524565425).

The spelling of 404332021 in words is "four hundred four million, three hundred thirty-two thousand, twenty-one".