2121222102217 has 2 divisors, whose sum is σ = 2121222102218. Its totient is φ = 2121222102216.

The previous prime is 2121222102169. The next prime is 2121222102221. The reversal of 2121222102217 is 7122012221212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2113333820361 + 7888281856 = 1453731^2 + 88816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121222102217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121222102191 and 2121222102200.

It is not a weakly prime, because it can be changed into another prime (2121222102917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611051108 + 1060611051109.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611051109).

Almost surely, 2^{2121222102217} is an apocalyptic number.

It is an amenable number.

2121222102217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222102217 is an equidigital number, since it uses as much as digits as its factorization.

2121222102217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 2121222102217 its reverse (7122012221212), we get a palindrome (9243234323429).

The spelling of 2121222102217 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred two thousand, two hundred seventeen".