990000200121121 has 16 divisors (see below), whose sum is σ = 1145805551779840. Its totient is φ = 837790065150480.

The previous prime is 990000200121113. The next prime is 990000200121133. The reversal of 990000200121121 is 121121002000099.

It is a cyclic number.

It is not a de Polignac number, because 990000200121121 - 2³ = 990000200121113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990000200121121.

It is not an unprimeable number, because it can be changed into a prime (990000200121161) 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, 31304745 + ... + 54405766.

It is an arithmetic number, because the mean of its divisors is an integer number (71612846986240).

Almost surely, 2^{990000200121121} is an apocalyptic number.

It is an amenable number.

990000200121121 is a deficient number, since it is larger than the sum of its proper divisors (155805351658719).

990000200121121 is a wasteful number, since it uses less digits than its factorization.

990000200121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85731484.

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

The spelling of 990000200121121 in words is "nine hundred ninety trillion, two hundred million, one hundred twenty-one thousand, one hundred twenty-one".