109921 has 8 divisors (see below), whose sum is σ = 129024. Its totient is φ = 91680.

The previous prime is 109919. The next prime is 109937. The reversal of 109921 is 129901.

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

It is a cyclic number.

It is not a de Polignac number, because 109921 - 2¹ = 109919 is a prime.

109921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 109892 and 109901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96 + ... + 478.

It is an arithmetic number, because the mean of its divisors is an integer number (16128).

2¹⁰⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

109921 is a deficient number, since it is larger than the sum of its proper divisors (19103).

109921 is an equidigital number, since it uses as much as digits as its factorization.

109921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 109921 is about 331.5433606634. The cubic root of 109921 is about 47.9027254548.

The spelling of 109921 in words is "one hundred nine thousand, nine hundred twenty-one".