109839021 has 4 divisors (see below), whose sum is σ = 146452032. Its totient is φ = 73226012.

The previous prime is 109839013. The next prime is 109839043. The reversal of 109839021 is 120938901.

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.

It is a cyclic number.

It is not a de Polignac number, because 109839021 - 2³ = 109839013 is a prime.

It is a super-2 number, since 2×109839021² = 24129221068476882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109839001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18306501 + ... + 18306506.

It is an arithmetic number, because the mean of its divisors is an integer number (36613008).

Almost surely, 2^109839021 is an apocalyptic number.

It is an amenable number.

109839021 is a deficient number, since it is larger than the sum of its proper divisors (36613011).

109839021 is an equidigital number, since it uses as much as digits as its factorization.

109839021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36613010.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 109839021 is about 10480.4112991810. The cubic root of 109839021 is about 478.9081388748.

The spelling of 109839021 in words is "one hundred nine million, eight hundred thirty-nine thousand, twenty-one".