2001222122209 has 2 divisors, whose sum is σ = 2001222122210. Its totient is φ = 2001222122208.

The previous prime is 2001222122189. The next prime is 2001222122213. The reversal of 2001222122209 is 9022212221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1940741541025 + 60480581184 = 1393105^2 + 245928^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001222122209 - 2¹⁷ = 2001221991137 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001222122309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000611061104 + 1000611061105.

It is an arithmetic number, because the mean of its divisors is an integer number (1000611061105).

Almost surely, 2^{2001222122209} is an apocalyptic number.

It is an amenable number.

2001222122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001222122209 is an equidigital number, since it uses as much as digits as its factorization.

2001222122209 is an evil number, because the sum of its binary digits is even.

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

The spelling of 2001222122209 in words is "two trillion, one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred nine".