2020010021 has 4 divisors (see below), whose sum is σ = 2020147500. Its totient is φ = 2019872544.

The previous prime is 2020010009. The next prime is 2020010033. The reversal of 2020010021 is 1200100202.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2020010009) and next prime (2020010033).

It can be written as a sum of positive squares in 2 ways, for example, as 1014422500 + 1005587521 = 31850^2 + 31711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020010021 - 2²⁶ = 1952901157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020009990 and 2020010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020016021) 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, 43646 + ... + 77103.

It is an arithmetic number, because the mean of its divisors is an integer number (505036875).

Almost surely, 2^2020010021 is an apocalyptic number.

It is an amenable number.

2020010021 is a deficient number, since it is larger than the sum of its proper divisors (137479).

2020010021 is a wasteful number, since it uses less digits than its factorization.

2020010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137478.

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

The square root of 2020010021 is about 44944.5215905120. The cubic root of 2020010021 is about 1264.1089552253.

Adding to 2020010021 its reverse (1200100202), we get a palindrome (3220110223).

The spelling of 2020010021 in words is "two billion, twenty million, ten thousand, twenty-one".