404002105521 has 24 divisors (see below), whose sum is σ = 626639442624. Its totient is φ = 230849529120.

The previous prime is 404002105511. The next prime is 404002105567. The reversal of 404002105521 is 125501200404.

It is not a de Polignac number, because 404002105521 - 2¹³ = 404002097329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404002105491 and 404002105500.

It is not an unprimeable number, because it can be changed into a prime (404002105511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7325911 + ... + 7380851.

It is an arithmetic number, because the mean of its divisors is an integer number (26109976776).

Almost surely, 2^404002105521 is an apocalyptic number.

It is an amenable number.

404002105521 is a deficient number, since it is larger than the sum of its proper divisors (222637337103).

404002105521 is a wasteful number, since it uses less digits than its factorization.

404002105521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104981 (or 104974 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 404002105521 its reverse (125501200404), we get a palindrome (529503305925).

The spelling of 404002105521 in words is "four hundred four billion, two million, one hundred five thousand, five hundred twenty-one".