20020003021 has 2 divisors, whose sum is σ = 20020003022. Its totient is φ = 20020003020.

The previous prime is 20020002997. The next prime is 20020003043. The reversal of 20020003021 is 12030002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15149917225 + 4870085796 = 123085^2 + 69786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020003021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020002989 and 20020003007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020003121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010001510 + 10010001511.

It is an arithmetic number, because the mean of its divisors is an integer number (10010001511).

Almost surely, 2^20020003021 is an apocalyptic number.

It is an amenable number.

20020003021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020003021 is an equidigital number, since it uses as much as digits as its factorization.

20020003021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 20020003021 its reverse (12030002002), we get a palindrome (32050005023).

The spelling of 20020003021 in words is "twenty billion, twenty million, three thousand, twenty-one".