21042004344042 has 64 divisors (see below), whose sum is σ = 47324826077184. Its totient is φ = 6182373239040.

The previous prime is 21042004344007. The next prime is 21042004344059. The reversal of 21042004344042 is 24044340024012.

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 31 ways as a sum of consecutive naturals, for example, 31366063 + ... + 32029890.

It is an arithmetic number, because the mean of its divisors is an integer number (739450407456).

Almost surely, 2^{21042004344042} is an apocalyptic number.

21042004344042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21042004344042 is an abundant number, since it is smaller than the sum of its proper divisors (26282821733142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21042004344042 is a wasteful number, since it uses less digits than its factorization.

21042004344042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63396123.

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21042004344042 its reverse (24044340024012), we get a palindrome (45086344368054).

The spelling of 21042004344042 in words is "twenty-one trillion, forty-two billion, four million, three hundred forty-four thousand, forty-two".