21563234306 has 16 divisors (see below), whose sum is σ = 32839533216. Its totient is φ = 10616840256.

The previous prime is 21563234279. The next prime is 21563234317. The reversal of 21563234306 is 60343236512.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360425 + ... + 415971.

It is an arithmetic number, because the mean of its divisors is an integer number (2052470826).

Almost surely, 2^21563234306 is an apocalyptic number.

21563234306 is a deficient number, since it is larger than the sum of its proper divisors (11276298910).

21563234306 is a wasteful number, since it uses less digits than its factorization.

21563234306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58513.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 21563234306 in words is "twenty-one billion, five hundred sixty-three million, two hundred thirty-four thousand, three hundred six".