121100120999 has 16 divisors (see below), whose sum is σ = 143680116384. Its totient is φ = 100616304000.

The previous prime is 121100120987. The next prime is 121100121011. The reversal of 121100120999 is 999021001121.

It is an interprime number because it is at equal distance from previous prime (121100120987) and next prime (121100121011).

It is a cyclic number.

It is not a de Polignac number, because 121100120999 - 2²⁴ = 121083343783 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 (121100120909) 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, 4177904 + ... + 4206789.

It is an arithmetic number, because the mean of its divisors is an integer number (8980007274).

Almost surely, 2^121100120999 is an apocalyptic number.

121100120999 is a deficient number, since it is larger than the sum of its proper divisors (22579995385).

121100120999 is a wasteful number, since it uses less digits than its factorization.

121100120999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8384818.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 121100120999 in words is "one hundred twenty-one billion, one hundred million, one hundred twenty thousand, nine hundred ninety-nine".