21042004342 has 32 divisors (see below), whose sum is σ = 33308319744. Its totient is φ = 9950239200.

The previous prime is 21042004331. The next prime is 21042004343. The reversal of 21042004342 is 24340024012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042004343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1460092 + ... + 1474432.

It is an arithmetic number, because the mean of its divisors is an integer number (1040884992).

Almost surely, 2^21042004342 is an apocalyptic number.

21042004342 is a deficient number, since it is larger than the sum of its proper divisors (12266315402).

21042004342 is a wasteful number, since it uses less digits than its factorization.

21042004342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14724.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21042004342 its reverse (24340024012), we get a palindrome (45382028354).

The spelling of 21042004342 in words is "twenty-one billion, forty-two million, four thousand, three hundred forty-two".