21444344242 has 4 divisors (see below), whose sum is σ = 32166516366. Its totient is φ = 10722172120.

The previous prime is 21444344203. The next prime is 21444344287. The reversal of 21444344242 is 24244344412.

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

It can be written as a sum of positive squares in only one way, i.e., 19577326561 + 1867017681 = 139919^2 + 43209^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21444344198 and 21444344207.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361086059 + ... + 5361086062.

Almost surely, 2^21444344242 is an apocalyptic number.

21444344242 is a deficient number, since it is larger than the sum of its proper divisors (10722172124).

21444344242 is a wasteful number, since it uses less digits than its factorization.

21444344242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722172123.

The product of its digits is 98304, while the sum is 34.

Adding to 21444344242 its reverse (24244344412), we get a palindrome (45688688654).

The spelling of 21444344242 in words is "twenty-one billion, four hundred forty-four million, three hundred forty-four thousand, two hundred forty-two".