109120021 has 8 divisors (see below), whose sum is σ = 115128000. Its totient is φ = 103138560.

The previous prime is 109120003. The next prime is 109120043. The reversal of 109120021 is 120021901.

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 109120021 - 2⁷ = 109119893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109119977 and 109120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109120061) 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, 2136 + ... + 14926.

It is an arithmetic number, because the mean of its divisors is an integer number (14391000).

Almost surely, 2^109120021 is an apocalyptic number.

It is an amenable number.

109120021 is a deficient number, since it is larger than the sum of its proper divisors (6007979).

109120021 is a wasteful number, since it uses less digits than its factorization.

109120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13259.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 109120021 is about 10446.0528909249. The cubic root of 109120021 is about 477.8608819426.

Adding to 109120021 its reverse (120021901), we get a palindrome (229141922).

It can be divided in two parts, 1091 and 20021, that added together give a palindrome (21112).

The spelling of 109120021 in words is "one hundred nine million, one hundred twenty thousand, twenty-one".