21044411143 has 4 divisors (see below), whose sum is σ = 24050755600. Its totient is φ = 18038066688.

The previous prime is 21044411137. The next prime is 21044411149. The reversal of 21044411143 is 34111444012.

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

It is an interprime number because it is at equal distance from previous prime (21044411137) and next prime (21044411149).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044411143 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 (21044411149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503172218 + ... + 1503172231.

It is an arithmetic number, because the mean of its divisors is an integer number (6012688900).

Almost surely, 2^21044411143 is an apocalyptic number.

21044411143 is a deficient number, since it is larger than the sum of its proper divisors (3006344457).

21044411143 is an equidigital number, since it uses as much as digits as its factorization.

21044411143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006344456.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21044411143 its reverse (34111444012), we get a palindrome (55155855155).

The spelling of 21044411143 in words is "twenty-one billion, forty-four million, four hundred eleven thousand, one hundred forty-three".