121002120209 has 8 divisors (see below), whose sum is σ = 128129195520. Its totient is φ = 113876078656.

The previous prime is 121002120157. The next prime is 121002120241. The reversal of 121002120209 is 902021200121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121002120209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121002120299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10649 + ... + 492054.

It is an arithmetic number, because the mean of its divisors is an integer number (16016149440).

Almost surely, 2^121002120209 is an apocalyptic number.

It is an amenable number.

121002120209 is a deficient number, since it is larger than the sum of its proper divisors (7127075311).

121002120209 is a wasteful number, since it uses less digits than its factorization.

121002120209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516879.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 121002120209 in words is "one hundred twenty-one billion, two million, one hundred twenty thousand, two hundred nine".