21444004143 has 48 divisors (see below), whose sum is σ = 32883302400. Its totient is φ = 13428452160.

The previous prime is 21444004091. The next prime is 21444004177. The reversal of 21444004143 is 34140044412.

21444004143 is a `hidden beast` number, since 214 + 4 + 400 + 4 + 1 + 43 = 666.

It is not a de Polignac number, because 21444004143 - 2²⁶ = 21376895279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444004193) 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 47 ways as a sum of consecutive naturals, for example, 11985693 + ... + 11987481.

It is an arithmetic number, because the mean of its divisors is an integer number (685068800).

Almost surely, 2^21444004143 is an apocalyptic number.

21444004143 is a deficient number, since it is larger than the sum of its proper divisors (11439298257).

21444004143 is a wasteful number, since it uses less digits than its factorization.

21444004143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372 (or 2369 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21444004143 its reverse (34140044412), we get a palindrome (55584048555).

The spelling of 21444004143 in words is "twenty-one billion, four hundred forty-four million, four thousand, one hundred forty-three".