21442144443 has 16 divisors (see below), whose sum is σ = 29198931840. Its totient is φ = 13992140864.

The previous prime is 21442144397. The next prime is 21442144463. The reversal of 21442144443 is 34444124412.

It is a cyclic number.

It is not a de Polignac number, because 21442144443 - 2⁶ = 21442144379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21442144463) 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 15 ways as a sum of consecutive naturals, for example, 218721 + ... + 301202.

It is an arithmetic number, because the mean of its divisors is an integer number (1824933240).

Almost surely, 2^21442144443 is an apocalyptic number.

21442144443 is a deficient number, since it is larger than the sum of its proper divisors (7756787397).

21442144443 is a wasteful number, since it uses less digits than its factorization.

21442144443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520218.

The product of its digits is 49152, while the sum is 33.

Adding to 21442144443 its reverse (34444124412), we get a palindrome (55886268855).

The spelling of 21442144443 in words is "twenty-one billion, four hundred forty-two million, one hundred forty-four thousand, four hundred forty-three".