2121200120009 has 16 divisors (see below), whose sum is σ = 2195652324096. Its totient is φ = 2048130643200.

The previous prime is 2121200119991. The next prime is 2121200120029. The reversal of 2121200120009 is 9000210021212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121200120009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121200120029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336899 + ... + 2087079.

It is an arithmetic number, because the mean of its divisors is an integer number (137228270256).

Almost surely, 2^{2121200120009} is an apocalyptic number.

It is an amenable number.

2121200120009 is a deficient number, since it is larger than the sum of its proper divisors (74452204087).

2121200120009 is a wasteful number, since it uses less digits than its factorization.

2121200120009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750576.

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

The spelling of 2121200120009 in words is "two trillion, one hundred twenty-one billion, two hundred million, one hundred twenty thousand, nine".