990200043121 has 4 divisors (see below), whose sum is σ = 990576118692. Its totient is φ = 989823967552.

The previous prime is 990200043089. The next prime is 990200043127. The reversal of 990200043121 is 121340002099.

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

It can be written as a sum of positive squares in 2 ways, for example, as 167117440000 + 823082603121 = 408800^2 + 907239^2 .

It is a cyclic number.

It is not a de Polignac number, because 990200043121 - 2⁵ = 990200043089 is a prime.

It is a super-2 number, since 2×990200043121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990200043127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188033836 + ... + 188039101.

It is an arithmetic number, because the mean of its divisors is an integer number (247644029673).

Almost surely, 2^990200043121 is an apocalyptic number.

It is an amenable number.

990200043121 is a deficient number, since it is larger than the sum of its proper divisors (376075571).

990200043121 is a wasteful number, since it uses less digits than its factorization.

990200043121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376075570.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 990200043121 in words is "nine hundred ninety billion, two hundred million, forty-three thousand, one hundred twenty-one".