404420040021 has 8 divisors (see below), whose sum is σ = 539739784864. Its totient is φ = 269356827600.

The previous prime is 404420039999. The next prime is 404420040043. The reversal of 404420040021 is 120040024404.

It is an interprime number because it is at equal distance from previous prime (404420039999) and next prime (404420040043).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404420040021 - 2⁶ = 404420039957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404420040021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404420040071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64129426 + ... + 64135731.

It is an arithmetic number, because the mean of its divisors is an integer number (67467473108).

Almost surely, 2^404420040021 is an apocalyptic number.

It is an amenable number.

404420040021 is a deficient number, since it is larger than the sum of its proper divisors (135319744843).

404420040021 is a wasteful number, since it uses less digits than its factorization.

404420040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128266211.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 404420040021 its reverse (120040024404), we get a palindrome (524460064425).

The spelling of 404420040021 in words is "four hundred four billion, four hundred twenty million, forty thousand, twenty-one".