2020001000021 has 2 divisors, whose sum is σ = 2020001000022. Its totient is φ = 2020001000020.

The previous prime is 2020001000009. The next prime is 2020001000047. The reversal of 2020001000021 is 1200001000202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2019698587921 + 302412100 = 1421161^2 + 17390^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020001000021 - 2¹⁰ = 2020000998997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2020000999972 and 2020001000008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020001000621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010000500010 + 1010000500011.

It is an arithmetic number, because the mean of its divisors is an integer number (1010000500011).

Almost surely, 2^{2020001000021} is an apocalyptic number.

It is an amenable number.

2020001000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020001000021 is an equidigital number, since it uses as much as digits as its factorization.

2020001000021 is an evil number, because the sum of its binary digits is even.

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

Adding to 2020001000021 its reverse (1200001000202), we get a palindrome (3220002000223).

It can be divided in two parts, 202000 and 1000021, that added together give a palindrome (1202021).

The spelling of 2020001000021 in words is "two trillion, twenty billion, one million, twenty-one", and thus it is an aban number and an uban number.