121000209999 has 8 divisors (see below), whose sum is σ = 161349575472. Its totient is φ = 80658825600.

The previous prime is 121000209997. The next prime is 121000210007. The reversal of 121000209999 is 999902000121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121000209999 - 2¹ = 121000209997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121000209999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000209997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1959802 + ... + 2020599.

It is an arithmetic number, because the mean of its divisors is an integer number (20168696934).

Almost surely, 2^121000209999 is an apocalyptic number.

121000209999 is a deficient number, since it is larger than the sum of its proper divisors (40349365473).

121000209999 is a wasteful number, since it uses less digits than its factorization.

121000209999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990537.

The product of its (nonzero) digits is 26244, while the sum is 42.

The spelling of 121000209999 in words is "one hundred twenty-one billion, two hundred nine thousand, nine hundred ninety-nine".