990012120211 has 4 divisors (see below), whose sum is σ = 990016027672. Its totient is φ = 990008212752.

The previous prime is 990012120187. The next prime is 990012120337. The reversal of 990012120211 is 112021210099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 990012120211 - 2¹¹ = 990012118163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990012120211.

It is not an unprimeable number, because it can be changed into a prime (990012126211) 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, 1545210 + ... + 2089903.

It is an arithmetic number, because the mean of its divisors is an integer number (247504006918).

Almost surely, 2^990012120211 is an apocalyptic number.

990012120211 is a deficient number, since it is larger than the sum of its proper divisors (3907461).

990012120211 is a wasteful number, since it uses less digits than its factorization.

990012120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907460.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 990012120211 in words is "nine hundred ninety billion, twelve million, one hundred twenty thousand, two hundred eleven".