100020001000121 has 4 divisors (see below), whose sum is σ = 100020028982244. Its totient is φ = 100019973018000.

The previous prime is 100020001000103. The next prime is 100020001000159. The reversal of 100020001000121 is 121000100020001.

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 90168318490000 + 9851682510121 = 9495700^2 + 3138739^2 .

It is a cyclic number.

It is not a de Polignac number, because 100020001000121 - 2³⁴ = 100002821130937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100020001000099 and 100020001000108.

It is not an unprimeable number, because it can be changed into a prime (100020001000181) 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, 7680710 + ... + 16094511.

It is an arithmetic number, because the mean of its divisors is an integer number (25005007245561).

Almost surely, 2^{100020001000121} is an apocalyptic number.

It is an amenable number.

100020001000121 is a deficient number, since it is larger than the sum of its proper divisors (27982123).

100020001000121 is an equidigital number, since it uses as much as digits as its factorization.

100020001000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27982122.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100020001000121 its reverse (121000100020001), we get a palindrome (221020101020122).

The spelling of 100020001000121 in words is "one hundred trillion, twenty billion, one million, one hundred twenty-one", and thus it is an aban number.