21044143342 has 16 divisors (see below), whose sum is σ = 32942702592. Its totient is φ = 10063354840.

The previous prime is 21044143333. The next prime is 21044143343. The reversal of 21044143342 is 24334144012.

It is a self number, because there is not a number n which added to its sum of digits gives 21044143342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044143343) 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 7 ways as a sum of consecutive naturals, for example, 431667 + ... + 477937.

It is an arithmetic number, because the mean of its divisors is an integer number (2058918912).

Almost surely, 2^21044143342 is an apocalyptic number.

21044143342 is a deficient number, since it is larger than the sum of its proper divisors (11898559250).

21044143342 is a wasteful number, since it uses less digits than its factorization.

21044143342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56183.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21044143342 its reverse (24334144012), we get a palindrome (45378287354).

The spelling of 21044143342 in words is "twenty-one billion, forty-four million, one hundred forty-three thousand, three hundred forty-two".