109221 has 12 divisors (see below), whose sum is σ = 169632. Its totient is φ = 62328.

The previous prime is 109211. The next prime is 109229. The reversal of 109221 is 122901.

It is a happy number.

It is not a de Polignac number, because 109221 - 2⁹ = 108709 is a prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 109221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (14136).

2¹⁰⁹²²¹ is an apocalyptic number.

It is an amenable number.

109221 is a deficient number, since it is larger than the sum of its proper divisors (60411).

109221 is an equidigital number, since it uses as much as digits as its factorization.

109221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 109221 is about 330.4860057552. The cubic root of 109221 is about 47.8008239676.

The spelling of 109221 in words is "one hundred nine thousand, two hundred twenty-one".