21041340042 has 64 divisors (see below), whose sum is σ = 44762886144. Its totient is φ = 6584719680.

The previous prime is 21041340041. The next prime is 21041340059. The reversal of 21041340042 is 24004314012.

It is not an unprimeable number, because it can be changed into a prime (21041340041) 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 31 ways as a sum of consecutive naturals, for example, 726613 + ... + 755015.

It is an arithmetic number, because the mean of its divisors is an integer number (699420096).

Almost surely, 2^21041340042 is an apocalyptic number.

21041340042 is an abundant number, since it is smaller than the sum of its proper divisors (23721546102).

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

21041340042 is a wasteful number, since it uses less digits than its factorization.

21041340042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28563.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21041340042 its reverse (24004314012), we get a palindrome (45045654054).

The spelling of 21041340042 in words is "twenty-one billion, forty-one million, three hundred forty thousand, forty-two".