20021244443 has 4 divisors (see below), whose sum is σ = 20219474688. Its totient is φ = 19823014200.

The previous prime is 20021244427. The next prime is 20021244461. The reversal of 20021244443 is 34444212002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20021244443 - 2⁴ = 20021244427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021244043) 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, 99114971 + ... + 99115172.

It is an arithmetic number, because the mean of its divisors is an integer number (5054868672).

Almost surely, 2^20021244443 is an apocalyptic number.

20021244443 is a deficient number, since it is larger than the sum of its proper divisors (198230245).

20021244443 is a wasteful number, since it uses less digits than its factorization.

20021244443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198230244.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 20021244443 its reverse (34444212002), we get a palindrome (54465456445).

The spelling of 20021244443 in words is "twenty billion, twenty-one million, two hundred forty-four thousand, four hundred forty-three".