21535502305 has 32 divisors (see below), whose sum is σ = 26844364800. Its totient is φ = 16573781952.

The previous prime is 21535502299. The next prime is 21535502323. The reversal of 21535502305 is 50320553512.

It is a cyclic number.

It is not a de Polignac number, because 21535502305 - 2³ = 21535502297 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8134492 + ... + 8137138.

It is an arithmetic number, because the mean of its divisors is an integer number (838886400).

Almost surely, 2^21535502305 is an apocalyptic number.

It is an amenable number.

21535502305 is a deficient number, since it is larger than the sum of its proper divisors (5308862495).

21535502305 is a wasteful number, since it uses less digits than its factorization.

21535502305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3253.

The product of its (nonzero) digits is 22500, while the sum is 31.

The spelling of 21535502305 in words is "twenty-one billion, five hundred thirty-five million, five hundred two thousand, three hundred five".