404563560421 has 4 divisors (see below), whose sum is σ = 404798636844. Its totient is φ = 404328484000.

The previous prime is 404563560419. The next prime is 404563560451. The reversal of 404563560421 is 124065365404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128845102500 + 275718457921 = 358950^2 + 525089^2 .

It is a cyclic number.

It is not a de Polignac number, because 404563560421 - 2¹ = 404563560419 is a prime.

It is a super-2 number, since 2×404563560421² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404563560451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117535630 + ... + 117539071.

It is an arithmetic number, because the mean of its divisors is an integer number (101199659211).

Almost surely, 2^404563560421 is an apocalyptic number.

It is an amenable number.

404563560421 is a deficient number, since it is larger than the sum of its proper divisors (235076423).

404563560421 is a wasteful number, since it uses less digits than its factorization.

404563560421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235076422.

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 404563560421 in words is "four hundred four billion, five hundred sixty-three million, five hundred sixty thousand, four hundred twenty-one".