21040810530 has 32 divisors (see below), whose sum is σ = 50546160000. Its totient is φ = 5605525632.

The previous prime is 21040810517. The next prime is 21040810559. The reversal of 21040810530 is 3501804012.

It is a self number, because there is not a number n which added to its sum of digits gives 21040810530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302830 + ... + 365769.

It is an arithmetic number, because the mean of its divisors is an integer number (1579567500).

Almost surely, 2^21040810530 is an apocalyptic number.

21040810530 is an abundant number, since it is smaller than the sum of its proper divisors (29505349470).

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

21040810530 is a wasteful number, since it uses less digits than its factorization.

21040810530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669658.

The product of its (nonzero) digits is 960, while the sum is 24.

The spelling of 21040810530 in words is "twenty-one billion, forty million, eight hundred ten thousand, five hundred thirty".