121109985 has 24 divisors (see below), whose sum is σ = 217701120. Its totient is φ = 64591344.

The previous prime is 121109959. The next prime is 121110037. The reversal of 121109985 is 589901121.

It is not a de Polignac number, because 121109985 - 2¹² = 121105889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48625 + ... + 51054.

It is an arithmetic number, because the mean of its divisors is an integer number (9070880).

Almost surely, 2^121109985 is an apocalyptic number.

121109985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121109985 is a deficient number, since it is larger than the sum of its proper divisors (96591135).

121109985 is an frugal number, since it uses more digits than its factorization.

121109985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99699 (or 99687 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 121109985 is about 11004.9981826441. The cubic root of 121109985 is about 494.7585599409.

The spelling of 121109985 in words is "one hundred twenty-one million, one hundred nine thousand, nine hundred eighty-five".