120121210999 has 4 divisors (see below), whose sum is σ = 120465398200. Its totient is φ = 119777023800.

The previous prime is 120121210991. The next prime is 120121211003. The reversal of 120121210999 is 999012121021.

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 120121210999 - 2³ = 120121210991 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 (120121210991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172093077 + ... + 172093774.

It is an arithmetic number, because the mean of its divisors is an integer number (30116349550).

Almost surely, 2^120121210999 is an apocalyptic number.

120121210999 is a deficient number, since it is larger than the sum of its proper divisors (344187201).

120121210999 is an equidigital number, since it uses as much as digits as its factorization.

120121210999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344187200.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 120121210999 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, nine hundred ninety-nine".