404844808021 has 2 divisors, whose sum is σ = 404844808022. Its totient is φ = 404844808020.

The previous prime is 404844807989. The next prime is 404844808033. The reversal of 404844808021 is 120808448404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370430476900 + 34414331121 = 608630^2 + 185511^2 .

It is a cyclic number.

It is not a de Polignac number, because 404844808021 - 2⁵ = 404844807989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404844808061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202422404010 + 202422404011.

It is an arithmetic number, because the mean of its divisors is an integer number (202422404011).

Almost surely, 2^404844808021 is an apocalyptic number.

It is an amenable number.

404844808021 is a deficient number, since it is larger than the sum of its proper divisors (1).

404844808021 is an equidigital number, since it uses as much as digits as its factorization.

404844808021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262144, while the sum is 43.

The spelling of 404844808021 in words is "four hundred four billion, eight hundred forty-four million, eight hundred eight thousand, twenty-one".