108685821 has 16 divisors (see below), whose sum is σ = 147026880. Its totient is φ = 71406720.

The previous prime is 108685813. The next prime is 108685891. The reversal of 108685821 is 128586801.

It is not a de Polignac number, because 108685821 - 2³ = 108685813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108685821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108685891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122646 + ... + 123528.

It is an arithmetic number, because the mean of its divisors is an integer number (9189180).

Almost surely, 2^108685821 is an apocalyptic number.

It is an amenable number.

108685821 is a deficient number, since it is larger than the sum of its proper divisors (38341059).

108685821 is an equidigital number, since it uses as much as digits as its factorization.

108685821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 108685821 is about 10425.2492056545. The cubic root of 108685821 is about 477.2262198905.

The spelling of 108685821 in words is "one hundred eight million, six hundred eighty-five thousand, eight hundred twenty-one".