109021 has 12 divisors (see below), whose sum is σ = 129276. Its totient is φ = 91520.

The previous prime is 109013. The next prime is 109037. The reversal of 109021 is 120901.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 27225 = 286^2 + 165^2 .

It is not a de Polignac number, because 109021 - 2³ = 109013 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 108992 and 109010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109001) 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 11 ways as a sum of consecutive naturals, for example, 2031 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (10773).

2¹⁰⁹⁰²¹ is an apocalyptic number.

109021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

109021 is a deficient number, since it is larger than the sum of its proper divisors (20255).

109021 is a wasteful number, since it uses less digits than its factorization.

109021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 109021 is about 330.1832824357. The cubic root of 109021 is about 47.7716293192.

Adding to 109021 its reverse (120901), we get a palindrome (229922).

It can be divided in two parts, 1090 and 21, that added together give a palindrome (1111).

The spelling of 109021 in words is "one hundred nine thousand, twenty-one".