20201121020021 has 8 divisors (see below), whose sum is σ = 21033074427288. Its totient is φ = 19385322048000.

The previous prime is 20201121019921. The next prime is 20201121020039. The reversal of 20201121020021 is 12002012110202.

It can be written as a sum of positive squares in 4 ways, for example, as 9848379121 + 20191272640900 = 99239^2 + 4493470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20201121020021 - 2⁴² = 15803074508917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20201121019978 and 20201121020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201121020071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4038606260 + ... + 4038611261.

It is an arithmetic number, because the mean of its divisors is an integer number (2629134303411).

Almost surely, 2^{20201121020021} is an apocalyptic number.

It is an amenable number.

20201121020021 is a deficient number, since it is larger than the sum of its proper divisors (831953407267).

20201121020021 is an equidigital number, since it uses as much as digits as its factorization.

20201121020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8077217623.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20201121020021 its reverse (12002012110202), we get a palindrome (32203133130223).

The spelling of 20201121020021 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, twenty thousand, twenty-one".