2122021217 has 2 divisors, whose sum is σ = 2122021218. Its totient is φ = 2122021216.

The previous prime is 2122021169. The next prime is 2122021219. The reversal of 2122021217 is 7121202212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223880256 + 898140961 = 34984^2 + 29969^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122021217 - 2¹⁰ = 2122020193 is a prime.

It is a super-2 number, since 2×2122021217² = 9005948090796322178, which contains 22 as substring.

Together with 2122021219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2122021219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061010608 + 1061010609.

It is an arithmetic number, because the mean of its divisors is an integer number (1061010609).

Almost surely, 2^2122021217 is an apocalyptic number.

It is an amenable number.

2122021217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122021217 is an equidigital number, since it uses as much as digits as its factorization.

2122021217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 2122021217 is about 46065.4015178420. The cubic root of 2122021217 is about 1285.0397857950.

Adding to 2122021217 its reverse (7121202212), we get a palindrome (9243223429).

The spelling of 2122021217 in words is "two billion, one hundred twenty-two million, twenty-one thousand, two hundred seventeen".