121109889 has 4 divisors (see below), whose sum is σ = 161479856. Its totient is φ = 80739924.

The previous prime is 121109873. The next prime is 121109959. The reversal of 121109889 is 988901121.

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 not a de Polignac number, because 121109889 - 2⁴ = 121109873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121109809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20184979 + ... + 20184984.

It is an arithmetic number, because the mean of its divisors is an integer number (40369964).

Almost surely, 2^121109889 is an apocalyptic number.

It is an amenable number.

121109889 is a deficient number, since it is larger than the sum of its proper divisors (40369967).

121109889 is an equidigital number, since it uses as much as digits as its factorization.

121109889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40369966.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 121109889 is about 11004.9938209887. The cubic root of 121109889 is about 494.7584292144.

The spelling of 121109889 in words is "one hundred twenty-one million, one hundred nine thousand, eight hundred eighty-nine".