21444021143 has 8 divisors (see below), whose sum is σ = 22492178112. Its totient is φ = 20420526816.

The previous prime is 21444021133. The next prime is 21444021161. The reversal of 21444021143 is 34112044412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21444021143 - 2⁸ = 21444020887 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 (21444021113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6163880 + ... + 6167357.

It is an arithmetic number, because the mean of its divisors is an integer number (2811522264).

Almost surely, 2^21444021143 is an apocalyptic number.

21444021143 is a deficient number, since it is larger than the sum of its proper divisors (1048156969).

21444021143 is a wasteful number, since it uses less digits than its factorization.

21444021143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12331321.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21444021143 its reverse (34112044412), we get a palindrome (55556065555).

The spelling of 21444021143 in words is "twenty-one billion, four hundred forty-four million, twenty-one thousand, one hundred forty-three".