202002020021 has 2 divisors, whose sum is σ = 202002020022. Its totient is φ = 202002020020.

The previous prime is 202002019957. The next prime is 202002020023. The reversal of 202002020021 is 120020200202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187891906225 + 14110113796 = 433465^2 + 118786^2 .

It is a cyclic number.

It is not a de Polignac number, because 202002020021 - 2⁶ = 202002019957 is a prime.

Together with 202002020023, 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 = 202002019984 and 202002020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202002020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101001010010 + 101001010011.

It is an arithmetic number, because the mean of its divisors is an integer number (101001010011).

Almost surely, 2^202002020021 is an apocalyptic number.

It is an amenable number.

202002020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202002020021 is an equidigital number, since it uses as much as digits as its factorization.

202002020021 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 202002020021 its reverse (120020200202), we get a palindrome (322022220223).

The spelling of 202002020021 in words is "two hundred two billion, two million, twenty thousand, twenty-one".