999900120200101 has 4 divisors (see below), whose sum is σ = 999916139938572. Its totient is φ = 999884100461632.

The previous prime is 999900120200099. The next prime is 999900120200117. The reversal of 999900120200101 is 101002021009999.

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 27631265337025 + 972268854863076 = 5256545^2 + 31181226^2 .

It is a cyclic number.

It is not a de Polignac number, because 999900120200101 - 2¹ = 999900120200099 is a prime.

It is a super-4 number, since 4×999900120200101⁴ (a number of 61 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999900120200161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8009775610 + ... + 8009900443.

It is an arithmetic number, because the mean of its divisors is an integer number (249979034984643).

Almost surely, 2^{999900120200101} is an apocalyptic number.

It is an amenable number.

999900120200101 is a deficient number, since it is larger than the sum of its proper divisors (16019738471).

999900120200101 is a wasteful number, since it uses less digits than its factorization.

999900120200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16019738470.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 999900120200101 in words is "nine hundred ninety-nine trillion, nine hundred billion, one hundred twenty million, two hundred thousand, one hundred one".