21098570185768 has 16 divisors (see below), whose sum is σ = 39561149688660. Its totient is φ = 10548930268800.

The previous prime is 21098570185747. The next prime is 21098570185783. The reversal of 21098570185768 is 86758107589012.

It can be written as a sum of positive squares in 2 ways, for example, as 21084608872804 + 13961312964 = 4591798^2 + 118158^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44100213 + ... + 44576068.

Almost surely, 2^{21098570185768} is an apocalyptic number.

It is an amenable number.

21098570185768 is a deficient number, since it is larger than the sum of its proper divisors (18462579502892).

21098570185768 is a wasteful number, since it uses less digits than its factorization.

21098570185768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88706028 (or 88706024 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 67.

The spelling of 21098570185768 in words is "twenty-one trillion, ninety-eight billion, five hundred seventy million, one hundred eighty-five thousand, seven hundred sixty-eight".