121200199999 has 8 divisors (see below), whose sum is σ = 129554403552. Its totient is φ = 113103048960.

The previous prime is 121200199979. The next prime is 121200200053. The reversal of 121200199999 is 999991002121.

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 121200199999 - 2⁷ = 121200199871 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 (121200199919) 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 7 ways as a sum of consecutive naturals, for example, 64262154 + ... + 64264039.

It is an arithmetic number, because the mean of its divisors is an integer number (16194300444).

Almost surely, 2^121200199999 is an apocalyptic number.

121200199999 is a deficient number, since it is larger than the sum of its proper divisors (8354203553).

121200199999 is a wasteful number, since it uses less digits than its factorization.

121200199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128526257.

The product of its (nonzero) digits is 236196, while the sum is 52.

The spelling of 121200199999 in words is "one hundred twenty-one billion, two hundred million, one hundred ninety-nine thousand, nine hundred ninety-nine".