121200012099 has 16 divisors (see below), whose sum is σ = 179560995840. Its totient is φ = 80797568040.

The previous prime is 121200012053. The next prime is 121200012149. The reversal of 121200012099 is 990210002121.

It is not a de Polignac number, because 121200012099 - 2¹⁷ = 121199881027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121201012099) 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 15 ways as a sum of consecutive naturals, for example, 1514214 + ... + 1592244.

It is an arithmetic number, because the mean of its divisors is an integer number (11222562240).

Almost surely, 2^121200012099 is an apocalyptic number.

121200012099 is a deficient number, since it is larger than the sum of its proper divisors (58360983741).

121200012099 is an equidigital number, since it uses as much as digits as its factorization.

121200012099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135567 (or 135561 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 121200012099 in words is "one hundred twenty-one billion, two hundred million, twelve thousand, ninety-nine".