109743821 has 4 divisors (see below), whose sum is σ = 119720544. Its totient is φ = 99767100.

The previous prime is 109743811. The next prime is 109743827. The reversal of 109743821 is 128347901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128347901 = 11 ⋅11667991.

It is a cyclic number.

It is not a de Polignac number, because 109743821 - 2¹⁰ = 109742797 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 (109743827) 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, 4988345 + ... + 4988366.

It is an arithmetic number, because the mean of its divisors is an integer number (29930136).

Almost surely, 2^109743821 is an apocalyptic number.

109743821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

109743821 is a deficient number, since it is larger than the sum of its proper divisors (9976723).

109743821 is an equidigital number, since it uses as much as digits as its factorization.

109743821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9976722.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 109743821 is about 10475.8685081477. The cubic root of 109743821 is about 478.7697386577.

The spelling of 109743821 in words is "one hundred nine million, seven hundred forty-three thousand, eight hundred twenty-one".