20004004521 has 12 divisors (see below), whose sum is σ = 30150963648. Its totient is φ = 12756176664.

The previous prime is 20004004519. The next prime is 20004004541. The reversal of 20004004521 is 12540040002.

20004004521 is a `hidden beast` number, since 200 + 0 + 400 + 45 + 21 = 666.

It is not a de Polignac number, because 20004004521 - 2¹ = 20004004519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20004004494 and 20004004503.

It is not an unprimeable number, because it can be changed into a prime (20004004541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48318645 + ... + 48319058.

It is an arithmetic number, because the mean of its divisors is an integer number (2512580304).

Almost surely, 2^20004004521 is an apocalyptic number.

It is an amenable number.

20004004521 is a deficient number, since it is larger than the sum of its proper divisors (10146959127).

20004004521 is a wasteful number, since it uses less digits than its factorization.

20004004521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96637732 (or 96637729 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 20004004521 its reverse (12540040002), we get a palindrome (32544044523).

The spelling of 20004004521 in words is "twenty billion, four million, four thousand, five hundred twenty-one".