20201100001021 has 4 divisors (see below), whose sum is σ = 20201350625500. Its totient is φ = 20200849376544.

The previous prime is 20201100001001. The next prime is 20201100001057. The reversal of 20201100001021 is 12010000110202.

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 12659150520900 + 7541949480121 = 3557970^2 + 2746261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201100001021 - 2¹⁵ = 20201099968253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201100000989 and 20201100001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201100001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125191296 + ... + 125352553.

It is an arithmetic number, because the mean of its divisors is an integer number (5050337656375).

Almost surely, 2^{20201100001021} is an apocalyptic number.

It is an amenable number.

20201100001021 is a deficient number, since it is larger than the sum of its proper divisors (250624479).

20201100001021 is an equidigital number, since it uses as much as digits as its factorization.

20201100001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250624478.

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

Adding to 20201100001021 its reverse (12010000110202), we get a palindrome (32211100111223).

The spelling of 20201100001021 in words is "twenty trillion, two hundred one billion, one hundred million, one thousand, twenty-one".