9121001000209 has 4 divisors (see below), whose sum is σ = 10424001143104. Its totient is φ = 7818000857316.

The previous prime is 9121001000117. The next prime is 9121001000249. The reversal of 9121001000209 is 9020001001219.

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 9121001000209 - 2¹⁹ = 9121000475921 is a prime.

It is a super-3 number, since 3×9121001000209³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9121001000249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651500071437 + ... + 651500071450.

It is an arithmetic number, because the mean of its divisors is an integer number (2606000285776).

Almost surely, 2^{9121001000209} is an apocalyptic number.

It is an amenable number.

9121001000209 is a deficient number, since it is larger than the sum of its proper divisors (1303000142895).

9121001000209 is a wasteful number, since it uses less digits than its factorization.

9121001000209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303000142894.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 9121001000209 in words is "nine trillion, one hundred twenty-one billion, one million, two hundred nine", and thus it is an aban number.