21648936959 has 8 divisors (see below), whose sum is σ = 23317035840. Its totient is φ = 19981237536.

The previous prime is 21648936929. The next prime is 21648937033. The reversal of 21648936959 is 95963984612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21648936959 - 2⁸ = 21648936703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648936929) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17849 + ... + 208845.

It is an arithmetic number, because the mean of its divisors is an integer number (2914629480).

Almost surely, 2^21648936959 is an apocalyptic number.

21648936959 is a deficient number, since it is larger than the sum of its proper divisors (1668098881).

21648936959 is a wasteful number, since it uses less digits than its factorization.

21648936959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199729.

The product of its digits is 25194240, while the sum is 62.

The spelling of 21648936959 in words is "twenty-one billion, six hundred forty-eight million, nine hundred thirty-six thousand, nine hundred fifty-nine".