109345021 has 4 divisors (see below), whose sum is σ = 110842972. Its totient is φ = 107847072.

The previous prime is 109345009. The next prime is 109345039. The reversal of 109345021 is 120543901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24502500 + 84842521 = 4950^2 + 9211^2 .

It is a cyclic number.

It is not a de Polignac number, because 109345021 - 2²³ = 100956413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109345121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748866 + ... + 749011.

It is an arithmetic number, because the mean of its divisors is an integer number (27710743).

Almost surely, 2^109345021 is an apocalyptic number.

It is an amenable number.

109345021 is a deficient number, since it is larger than the sum of its proper divisors (1497951).

109345021 is an equidigital number, since it uses as much as digits as its factorization.

109345021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497950.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 109345021 is about 10456.8169631107. The cubic root of 109345021 is about 478.1890981660.

Adding to 109345021 its reverse (120543901), we get a palindrome (229888922).

The spelling of 109345021 in words is "one hundred nine million, three hundred forty-five thousand, twenty-one".