2021222120209 has 2 divisors, whose sum is σ = 2021222120210. Its totient is φ = 2021222120208.

The previous prime is 2021222120179. The next prime is 2021222120249. The reversal of 2021222120209 is 9020212221202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1947657492225 + 73564627984 = 1395585^2 + 271228^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021222120209 - 2¹¹ = 2021222118161 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021222120249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010611060104 + 1010611060105.

It is an arithmetic number, because the mean of its divisors is an integer number (1010611060105).

Almost surely, 2^{2021222120209} is an apocalyptic number.

It is an amenable number.

2021222120209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021222120209 is an equidigital number, since it uses as much as digits as its factorization.

2021222120209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 2021222120209 in words is "two trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred nine".