108021 has 4 divisors (see below), whose sum is σ = 144032. Its totient is φ = 72012.

The previous prime is 108013. The next prime is 108023. The reversal of 108021 is 120801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 108021 - 2³ = 108013 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 107988 and 108006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 108021.

It is not an unprimeable number, because it can be changed into a prime (108023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18001 + ... + 18006.

It is an arithmetic number, because the mean of its divisors is an integer number (36008).

2¹⁰⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

108021 is a deficient number, since it is larger than the sum of its proper divisors (36011).

108021 is an equidigital number, since it uses as much as digits as its factorization.

108021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36010.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 108021 is about 328.6654834326. The cubic root of 108021 is about 47.6251179722.

Adding to 108021 its reverse (120801), we get a palindrome (228822).

The spelling of 108021 in words is "one hundred eight thousand, twenty-one".