21444404342 has 8 divisors (see below), whose sum is σ = 32167681032. Its totient is φ = 10721844000.

The previous prime is 21444404341. The next prime is 21444404353. The reversal of 21444404342 is 24340444412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21444404299 and 21444404308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444404341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96659 + ... + 228542.

It is an arithmetic number, because the mean of its divisors is an integer number (4020960129).

Almost surely, 2^21444404342 is an apocalyptic number.

21444404342 is a deficient number, since it is larger than the sum of its proper divisors (10723276690).

21444404342 is a wasteful number, since it uses less digits than its factorization.

21444404342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358174.

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21444404342 its reverse (24340444412), we get a palindrome (45784848754).

The spelling of 21444404342 in words is "twenty-one billion, four hundred forty-four million, four hundred four thousand, three hundred forty-two".