121888199 has 4 divisors (see below), whose sum is σ = 122043864. Its totient is φ = 121732536.

The previous prime is 121888183. The next prime is 121888237. The reversal of 121888199 is 991888121.

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

It is a cyclic number.

It is not a de Polignac number, because 121888199 - 2⁴ = 121888183 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 (121888099) 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, 76652 + ... + 78225.

It is an arithmetic number, because the mean of its divisors is an integer number (30510966).

Almost surely, 2^121888199 is an apocalyptic number.

121888199 is a deficient number, since it is larger than the sum of its proper divisors (155665).

121888199 is an equidigital number, since it uses as much as digits as its factorization.

121888199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155664.

The product of its digits is 82944, while the sum is 47.

The square root of 121888199 is about 11040.2988637084. The cubic root of 121888199 is about 495.8160182515.

The spelling of 121888199 in words is "one hundred twenty-one million, eight hundred eighty-eight thousand, one hundred ninety-nine".