404442040021 has 12 divisors (see below), whose sum is σ = 426940455744. Its totient is φ = 383073345000.

The previous prime is 404442040007. The next prime is 404442040033. The reversal of 404442040021 is 120040244404.

It is not a de Polignac number, because 404442040021 - 2²⁷ = 404307822293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404442040091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1597206 + ... + 1833016.

It is an arithmetic number, because the mean of its divisors is an integer number (35578371312).

Almost surely, 2^404442040021 is an apocalyptic number.

It is an amenable number.

404442040021 is a deficient number, since it is larger than the sum of its proper divisors (22498415723).

404442040021 is a wasteful number, since it uses less digits than its factorization.

404442040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240600 (or 240581 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 404442040021 its reverse (120040244404), we get a palindrome (524482284425).

It can be divided in two parts, 4044420 and 40021, that added together give a square (4084441 = 2021²).

The spelling of 404442040021 in words is "four hundred four billion, four hundred forty-two million, forty thousand, twenty-one".