21303615634 has 48 divisors (see below), whose sum is σ = 38842193088. Its totient is φ = 8721148128.

The previous prime is 21303615601. The next prime is 21303615643. The reversal of 21303615634 is 43651630312.

It is a self number, because there is not a number n which added to its sum of digits gives 21303615634.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1736229 + ... + 1748455.

It is an arithmetic number, because the mean of its divisors is an integer number (809212356).

Almost surely, 2^21303615634 is an apocalyptic number.

21303615634 is a deficient number, since it is larger than the sum of its proper divisors (17538577454).

21303615634 is a wasteful number, since it uses less digits than its factorization.

21303615634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13039 (or 13032 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 21303615634 in words is "twenty-one billion, three hundred three million, six hundred fifteen thousand, six hundred thirty-four".