20044043021 has 4 divisors (see below), whose sum is σ = 20086964352. Its totient is φ = 20001121692.

The previous prime is 20044043017. The next prime is 20044043029. The reversal of 20044043021 is 12034044002.

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 20044043021 - 2² = 20044043017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20044042984 and 20044043002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20044043029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21459965 + ... + 21460898.

It is an arithmetic number, because the mean of its divisors is an integer number (5021741088).

Almost surely, 2^20044043021 is an apocalyptic number.

It is an amenable number.

20044043021 is a deficient number, since it is larger than the sum of its proper divisors (42921331).

20044043021 is an equidigital number, since it uses as much as digits as its factorization.

20044043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42921330.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20044043021 its reverse (12034044002), we get a palindrome (32078087023).

The spelling of 20044043021 in words is "twenty billion, forty-four million, forty-three thousand, twenty-one".