109119821 has 4 divisors (see below), whose sum is σ = 115538652. Its totient is φ = 102700992.

The previous prime is 109119809. The next prime is 109119841. The reversal of 109119821 is 128911901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128911901 = 17 ⋅7583053.

It can be written as a sum of positive squares in 2 ways, for example, as 57078025 + 52041796 = 7555^2 + 7214^2 .

It is a cyclic number.

It is not a de Polignac number, because 109119821 - 2⁶ = 109119757 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 (109119841) 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, 3209390 + ... + 3209423.

It is an arithmetic number, because the mean of its divisors is an integer number (28884663).

Almost surely, 2^109119821 is an apocalyptic number.

It is an amenable number.

109119821 is a deficient number, since it is larger than the sum of its proper divisors (6418831).

109119821 is an equidigital number, since it uses as much as digits as its factorization.

109119821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6418830.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 109119821 is about 10446.0433179266. The cubic root of 109119821 is about 477.8605899942.

The spelling of 109119821 in words is "one hundred nine million, one hundred nineteen thousand, eight hundred twenty-one".