121155105 has 8 divisors (see below), whose sum is σ = 193848192. Its totient is φ = 64616048.

The previous prime is 121155061. The next prime is 121155109. The reversal of 121155105 is 501551121.

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 121155105 - 2¹⁹ = 120630817 is a prime.

It is a super-3 number, since 3×121155105³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (121155109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4038489 + ... + 4038518.

It is an arithmetic number, because the mean of its divisors is an integer number (24231024).

Almost surely, 2^121155105 is an apocalyptic number.

121155105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121155105 is a deficient number, since it is larger than the sum of its proper divisors (72693087).

121155105 is an equidigital number, since it uses as much as digits as its factorization.

121155105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8077015.

The product of its (nonzero) digits is 250, while the sum is 21.

The square root of 121155105 is about 11007.0479693694. The cubic root of 121155105 is about 494.8199937265.

The spelling of 121155105 in words is "one hundred twenty-one million, one hundred fifty-five thousand, one hundred five".