109399921 has 8 divisors (see below), whose sum is σ = 110626560. Its totient is φ = 108177552.

The previous prime is 109399909. The next prime is 109399943. The reversal of 109399921 is 129993901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109399921 - 2⁵ = 109399889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109399951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93486 + ... + 94648.

It is an arithmetic number, because the mean of its divisors is an integer number (13828320).

Almost surely, 2^109399921 is an apocalyptic number.

It is an amenable number.

109399921 is a deficient number, since it is larger than the sum of its proper divisors (1226639).

109399921 is a wasteful number, since it uses less digits than its factorization.

109399921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 109399921 is about 10459.4417155028. The cubic root of 109399921 is about 478.2691145790.

The spelling of 109399921 in words is "one hundred nine million, three hundred ninety-nine thousand, nine hundred twenty-one".