21344344042042 has 32 divisors (see below), whose sum is σ = 36684703740672. Its totient is φ = 9123978910464.

The previous prime is 21344344042031. The next prime is 21344344042157. The reversal of 21344344042042 is 24024044344312.

It is a junction number, because it is equal to n+sod(n) for n = 21344344041992 and 21344344042010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98729938 + ... + 98945890.

It is an arithmetic number, because the mean of its divisors is an integer number (1146396991896).

Almost surely, 2^{21344344042042} is an apocalyptic number.

21344344042042 is a deficient number, since it is larger than the sum of its proper divisors (15340359698630).

21344344042042 is a wasteful number, since it uses less digits than its factorization.

21344344042042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234142.

The product of its (nonzero) digits is 294912, while the sum is 37.

Adding to 21344344042042 its reverse (24024044344312), we get a palindrome (45368388386354).

The spelling of 21344344042042 in words is "twenty-one trillion, three hundred forty-four billion, three hundred forty-four million, forty-two thousand, forty-two".