109321021 has 4 divisors (see below), whose sum is σ = 109594044. Its totient is φ = 109048000.

The previous prime is 109320989. The next prime is 109321049. The reversal of 109321021 is 120123901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120123901 = 1709 ⋅70289.

It can be written as a sum of positive squares in 2 ways, for example, as 104325796 + 4995225 = 10214^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 109321021 - 2⁵ = 109320989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109321021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109321061) 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 3 ways as a sum of consecutive naturals, for example, 135910 + ... + 136711.

It is an arithmetic number, because the mean of its divisors is an integer number (27398511).

Almost surely, 2^109321021 is an apocalyptic number.

It is an amenable number.

109321021 is a deficient number, since it is larger than the sum of its proper divisors (273023).

109321021 is an equidigital number, since it uses as much as digits as its factorization.

109321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273022.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 109321021 is about 10455.6693233862. The cubic root of 109321021 is about 478.1541098998.

Adding to 109321021 its reverse (120123901), we get a palindrome (229444922).

The spelling of 109321021 in words is "one hundred nine million, three hundred twenty-one thousand, twenty-one".