404400402421 has 8 divisors (see below), whose sum is σ = 406605492320. Its totient is φ = 402200778672.

The previous prime is 404400402379. The next prime is 404400402443. The reversal of 404400402421 is 124204004404.

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

It is a cyclic number.

It is not a de Polignac number, because 404400402421 - 2¹⁷ = 404400271349 is a prime.

It is a super-2 number, since 2×404400402421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404400402121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1218126 + ... + 1514143.

It is an arithmetic number, because the mean of its divisors is an integer number (50825686540).

Almost surely, 2^404400402421 is an apocalyptic number.

It is an amenable number.

404400402421 is a deficient number, since it is larger than the sum of its proper divisors (2205089899).

404400402421 is a wasteful number, since it uses less digits than its factorization.

404400402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733075.

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

Adding to 404400402421 its reverse (124204004404), we get a palindrome (528604406825).

The spelling of 404400402421 in words is "four hundred four billion, four hundred million, four hundred two thousand, four hundred twenty-one".