121912099 has 4 divisors (see below), whose sum is σ = 123910720. Its totient is φ = 119913480.

The previous prime is 121912097. The next prime is 121912169. The reversal of 121912099 is 990219121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990219121 = 197 ⋅5026493.

It is a cyclic number.

It is not a de Polignac number, because 121912099 - 2¹ = 121912097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121912097) 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 3 ways as a sum of consecutive naturals, for example, 999219 + ... + 999340.

It is an arithmetic number, because the mean of its divisors is an integer number (30977680).

Almost surely, 2^121912099 is an apocalyptic number.

121912099 is a deficient number, since it is larger than the sum of its proper divisors (1998621).

121912099 is an equidigital number, since it uses as much as digits as its factorization.

121912099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998620.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 121912099 is about 11041.3812088887. The cubic root of 121912099 is about 495.8484228882.

The spelling of 121912099 in words is "one hundred twenty-one million, nine hundred twelve thousand, ninety-nine".