21617752618 has 16 divisors (see below), whose sum is σ = 40428005184. Its totient is φ = 8422500960.

The previous prime is 21617752603. The next prime is 21617752631. The reversal of 21617752618 is 81625771612.

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 7 ways as a sum of consecutive naturals, for example, 70187355 + ... + 70187662.

It is an arithmetic number, because the mean of its divisors is an integer number (2526750324).

Almost surely, 2^21617752618 is an apocalyptic number.

21617752618 is a deficient number, since it is larger than the sum of its proper divisors (18810252566).

21617752618 is a wasteful number, since it uses less digits than its factorization.

21617752618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140375037.

The product of its digits is 282240, while the sum is 46.

The spelling of 21617752618 in words is "twenty-one billion, six hundred seventeen million, seven hundred fifty-two thousand, six hundred eighteen".