2001022221217 has 2 divisors, whose sum is σ = 2001022221218. Its totient is φ = 2001022221216.

The previous prime is 2001022221203. The next prime is 2001022221227. The reversal of 2001022221217 is 7121222201002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063299194896 + 937723026321 = 1031164^2 + 968361^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001022221217 - 2⁷ = 2001022221089 is a prime.

It is a super-2 number, since 2×2001022221217² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2001022221227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000511110608 + 1000511110609.

It is an arithmetic number, because the mean of its divisors is an integer number (1000511110609).

Almost surely, 2^{2001022221217} is an apocalyptic number.

It is an amenable number.

2001022221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001022221217 is an equidigital number, since it uses as much as digits as its factorization.

2001022221217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 2001022221217 its reverse (7121222201002), we get a palindrome (9122244422219).

The spelling of 2001022221217 in words is "two trillion, one billion, twenty-two million, two hundred twenty-one thousand, two hundred seventeen".