21104345442 has 32 divisors (see below), whose sum is σ = 43059631104. Its totient is φ = 6894146000.

The previous prime is 21104345417. The next prime is 21104345443. The reversal of 21104345442 is 24454340112.

It is not an unprimeable number, because it can be changed into a prime (21104345443) 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, 77184 + ... + 219467.

It is an arithmetic number, because the mean of its divisors is an integer number (1345613472).

Almost surely, 2^21104345442 is an apocalyptic number.

21104345442 is an abundant number, since it is smaller than the sum of its proper divisors (21955285662).

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

21104345442 is a wasteful number, since it uses less digits than its factorization.

21104345442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296894.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21104345442 its reverse (24454340112), we get a palindrome (45558685554).

The spelling of 21104345442 in words is "twenty-one billion, one hundred four million, three hundred forty-five thousand, four hundred forty-two".