109436021 has 4 divisors (see below), whose sum is σ = 115873452. Its totient is φ = 102998592.

The previous prime is 109436017. The next prime is 109436023. The reversal of 109436021 is 120634901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120634901 = 4831 ⋅24971.

It can be written as a sum of positive squares in 2 ways, for example, as 43744996 + 65691025 = 6614^2 + 8105^2 .

It is a cyclic number.

It is not a de Polignac number, because 109436021 - 2² = 109436017 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 (109436023) 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, 3218690 + ... + 3218723.

It is an arithmetic number, because the mean of its divisors is an integer number (28968363).

Almost surely, 2^109436021 is an apocalyptic number.

It is an amenable number.

109436021 is a deficient number, since it is larger than the sum of its proper divisors (6437431).

109436021 is an equidigital number, since it uses as much as digits as its factorization.

109436021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6437430.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 109436021 is about 10461.1672866846. The cubic root of 109436021 is about 478.3217155198.

The spelling of 109436021 in words is "one hundred nine million, four hundred thirty-six thousand, twenty-one".