100009990121 has 4 divisors (see below), whose sum is σ = 103458610500. Its totient is φ = 96561369744.

The previous prime is 100009990117. The next prime is 100009990123. The reversal of 100009990121 is 121099900001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121099900001 = 181 ⋅669060221.

It can be written as a sum of positive squares in 2 ways, for example, as 36342084496 + 63667905625 = 190636^2 + 252325^2 .

It is a cyclic number.

It is not a de Polignac number, because 100009990121 - 2² = 100009990117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100009990123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1724310146 + ... + 1724310203.

It is an arithmetic number, because the mean of its divisors is an integer number (25864652625).

Almost surely, 2^100009990121 is an apocalyptic number.

It is an amenable number.

100009990121 is a deficient number, since it is larger than the sum of its proper divisors (3448620379).

100009990121 is an equidigital number, since it uses as much as digits as its factorization.

100009990121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448620378.

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 100009990121 in words is "one hundred billion, nine million, nine hundred ninety thousand, one hundred twenty-one".