108693921 has 16 divisors (see below), whose sum is σ = 165803904. Its totient is φ = 62045184.

The previous prime is 108693919. The next prime is 108693947. The reversal of 108693921 is 129396801.

It is not a de Polignac number, because 108693921 - 2¹ = 108693919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108693921.

It is not an unprimeable number, because it can be changed into a prime (108693961) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 23431 + ... + 27683.

It is an arithmetic number, because the mean of its divisors is an integer number (10362744).

Almost surely, 2^108693921 is an apocalyptic number.

It is an amenable number.

108693921 is a deficient number, since it is larger than the sum of its proper divisors (57109983).

108693921 is a wasteful number, since it uses less digits than its factorization.

108693921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 108693921 is about 10425.6376783389. The cubic root of 108693921 is about 477.2380749675.

The spelling of 108693921 in words is "one hundred eight million, six hundred ninety-three thousand, nine hundred twenty-one".