2020043021 has 2 divisors, whose sum is σ = 2020043022. Its totient is φ = 2020043020.

The previous prime is 2020042991. The next prime is 2020043029. The reversal of 2020043021 is 1203400202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1998984100 + 21058921 = 44710^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020043021 - 2¹⁸ = 2019780877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2020042987 and 2020043005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020043029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010021510 + 1010021511.

It is an arithmetic number, because the mean of its divisors is an integer number (1010021511).

Almost surely, 2^2020043021 is an apocalyptic number.

It is an amenable number.

2020043021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020043021 is an equidigital number, since it uses as much as digits as its factorization.

2020043021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 2020043021 is about 44944.8887082836. Note that the first 3 decimals coincide. The cubic root of 2020043021 is about 1264.1158389153.

Adding to 2020043021 its reverse (1203400202), we get a palindrome (3223443223).

The spelling of 2020043021 in words is "two billion, twenty million, forty-three thousand, twenty-one".