20010121200001 has 4 divisors (see below), whose sum is σ = 20010588321604. Its totient is φ = 20009654078400.

The previous prime is 20010121199989. The next prime is 20010121200029. The reversal of 20010121200001 is 10000212101002.

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 7801742785600 + 12208378414401 = 2793160^2 + 3494049^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010121200001 - 2⁵ = 20010121199969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010121201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233496540 + ... + 233582221.

It is an arithmetic number, because the mean of its divisors is an integer number (5002647080401).

Almost surely, 2^{20010121200001} is an apocalyptic number.

It is an amenable number.

20010121200001 is a deficient number, since it is larger than the sum of its proper divisors (467121603).

20010121200001 is an equidigital number, since it uses as much as digits as its factorization.

20010121200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467121602.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20010121200001 its reverse (10000212101002), we get a palindrome (30010333301003).

The spelling of 20010121200001 in words is "twenty trillion, ten billion, one hundred twenty-one million, two hundred thousand, one".