20020202021 has 2 divisors, whose sum is σ = 20020202022. Its totient is φ = 20020202020.

The previous prime is 20020202009. The next prime is 20020202023. The reversal of 20020202021 is 12020202002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19772296996 + 247905025 = 140614^2 + 15745^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020202021 - 2¹⁴ = 20020185637 is a prime.

Together with 20020202023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020201993 and 20020202011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020202023) 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, 10010101010 + 10010101011.

It is an arithmetic number, because the mean of its divisors is an integer number (10010101011).

Almost surely, 2^20020202021 is an apocalyptic number.

It is an amenable number.

20020202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020202021 is an equidigital number, since it uses as much as digits as its factorization.

20020202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20020202021 its reverse (12020202002), we get a palindrome (32040404023).

The spelling of 20020202021 in words is "twenty billion, twenty million, two hundred two thousand, twenty-one".