200121110012009 has 4 divisors (see below), whose sum is σ = 200649134049360. Its totient is φ = 199593085974660.

The previous prime is 200121110011993. The next prime is 200121110012011. The reversal of 200121110012009 is 900210011121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200121110012009 - 2⁴ = 200121110011993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200121110012909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264012018107 + ... + 264012018864.

It is an arithmetic number, because the mean of its divisors is an integer number (50162283512340).

Almost surely, 2^{200121110012009} is an apocalyptic number.

It is an amenable number.

200121110012009 is a deficient number, since it is larger than the sum of its proper divisors (528024037351).

200121110012009 is an equidigital number, since it uses as much as digits as its factorization.

200121110012009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528024037350.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 200121110012009 in words is "two hundred trillion, one hundred twenty-one billion, one hundred ten million, twelve thousand, nine".