121042109 has 4 divisors (see below), whose sum is σ = 121455516. Its totient is φ = 120628704.

The previous prime is 121042093. The next prime is 121042111. The reversal of 121042109 is 901240121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110460100 + 10582009 = 10510^2 + 3253^2 .

It is a cyclic number.

It is not a de Polignac number, because 121042109 - 2⁴ = 121042093 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 (121042139) 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, 206264 + ... + 206849.

It is an arithmetic number, because the mean of its divisors is an integer number (30363879).

Almost surely, 2^121042109 is an apocalyptic number.

It is an amenable number.

121042109 is a deficient number, since it is larger than the sum of its proper divisors (413407).

121042109 is an equidigital number, since it uses as much as digits as its factorization.

121042109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413406.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 121042109 is about 11001.9138789576. The cubic root of 121042109 is about 494.6661136473. Note that the first 3 decimals are identical.

The spelling of 121042109 in words is "one hundred twenty-one million, forty-two thousand, one hundred nine".