20004203421 has 16 divisors (see below), whose sum is σ = 30121693120. Its totient is φ = 13117509360.

The previous prime is 20004203413. The next prime is 20004203423. The reversal of 20004203421 is 12430240002.

20004203421 is a `hidden beast` number, since 200 + 0 + 42 + 0 + 3 + 421 = 666.

It is not a de Polignac number, because 20004203421 - 2³ = 20004203413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20004203394 and 20004203403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004203423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6071275 + ... + 6074568.

It is an arithmetic number, because the mean of its divisors is an integer number (1882605820).

Almost surely, 2^20004203421 is an apocalyptic number.

It is an amenable number.

20004203421 is a deficient number, since it is larger than the sum of its proper divisors (10117489699).

20004203421 is a wasteful number, since it uses less digits than its factorization.

20004203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12145913 (or 12145907 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20004203421 its reverse (12430240002), we get a palindrome (32434443423).

The spelling of 20004203421 in words is "twenty billion, four million, two hundred three thousand, four hundred twenty-one".