2020100020021 has 4 divisors (see below), whose sum is σ = 2028552321600. Its totient is φ = 2011647718444.

The previous prime is 2020100020013. The next prime is 2020100020033. The reversal of 2020100020021 is 1200200010202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2020100020021 - 2³ = 2020100020013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020100020121) 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, 4226150431 + ... + 4226150908.

It is an arithmetic number, because the mean of its divisors is an integer number (507138080400).

Almost surely, 2^{2020100020021} is an apocalyptic number.

It is an amenable number.

2020100020021 is a deficient number, since it is larger than the sum of its proper divisors (8452301579).

2020100020021 is an equidigital number, since it uses as much as digits as its factorization.

2020100020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8452301578.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2020100020021 its reverse (1200200010202), we get a palindrome (3220300030223).

The spelling of 2020100020021 in words is "two trillion, twenty billion, one hundred million, twenty thousand, twenty-one".