20104443421 has 4 divisors (see below), whose sum is σ = 20123573344. Its totient is φ = 20085313500.

The previous prime is 20104443409. The next prime is 20104443431. The reversal of 20104443421 is 12434440102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20104443421 - 2⁹ = 20104442909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104443431) 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, 9563385 + ... + 9565486.

It is an arithmetic number, because the mean of its divisors is an integer number (5030893336).

Almost surely, 2^20104443421 is an apocalyptic number.

It is an amenable number.

20104443421 is a deficient number, since it is larger than the sum of its proper divisors (19129923).

20104443421 is a wasteful number, since it uses less digits than its factorization.

20104443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19129922.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 20104443421 its reverse (12434440102), we get a palindrome (32538883523).

The spelling of 20104443421 in words is "twenty billion, one hundred four million, four hundred forty-three thousand, four hundred twenty-one".