404110021 has 4 divisors (see below), whose sum is σ = 461840032. Its totient is φ = 346380012.

The previous prime is 404109971. The next prime is 404110027. The reversal of 404110021 is 120011404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404110021 - 2¹⁹ = 403585733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404109983 and 404110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404110027) 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 3 ways as a sum of consecutive naturals, for example, 28864995 + ... + 28865008.

It is an arithmetic number, because the mean of its divisors is an integer number (115460008).

Almost surely, 2^404110021 is an apocalyptic number.

It is an amenable number.

404110021 is a deficient number, since it is larger than the sum of its proper divisors (57730011).

404110021 is an equidigital number, since it uses as much as digits as its factorization.

404110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57730010.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 404110021 is about 20102.4879306020. The cubic root of 404110021 is about 739.3212799156.

Adding to 404110021 its reverse (120011404), we get a palindrome (524121425).

The spelling of 404110021 in words is "four hundred four million, one hundred ten thousand, twenty-one".