200020012021 has 2 divisors, whose sum is σ = 200020012022. Its totient is φ = 200020012020.

The previous prime is 200020012019. The next prime is 200020012061. The reversal of 200020012021 is 120210020002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126139335921 + 73880676100 = 355161^2 + 271810^2 .

It is a cyclic number.

It is not a de Polignac number, because 200020012021 - 2¹ = 200020012019 is a prime.

Together with 200020012019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 200020011989 and 200020012007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200020012061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010006010 + 100010006011.

It is an arithmetic number, because the mean of its divisors is an integer number (100010006011).

Almost surely, 2^200020012021 is an apocalyptic number.

It is an amenable number.

200020012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200020012021 is an equidigital number, since it uses as much as digits as its factorization.

200020012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 200020012021 its reverse (120210020002), we get a palindrome (320230032023).

The spelling of 200020012021 in words is "two hundred billion, twenty million, twelve thousand, twenty-one".