20004244421 has 4 divisors (see below), whose sum is σ = 22861993632. Its totient is φ = 17146495212.

The previous prime is 20004244409. The next prime is 20004244423. The reversal of 20004244421 is 12444240002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12444240002 = 2 ⋅6222120001.

It is not a de Polignac number, because 20004244421 - 2¹⁸ = 20003982277 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 (20004244423) 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, 1428874595 + ... + 1428874608.

It is an arithmetic number, because the mean of its divisors is an integer number (5715498408).

Almost surely, 2^20004244421 is an apocalyptic number.

It is an amenable number.

20004244421 is a deficient number, since it is larger than the sum of its proper divisors (2857749211).

20004244421 is an equidigital number, since it uses as much as digits as its factorization.

20004244421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857749210.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20004244421 its reverse (12444240002), we get a palindrome (32448484423).

The spelling of 20004244421 in words is "twenty billion, four million, two hundred forty-four thousand, four hundred twenty-one".