2172007217 has 2 divisors, whose sum is σ = 2172007218. Its totient is φ = 2172007216.

The previous prime is 2172007181. The next prime is 2172007241. The reversal of 2172007217 is 7127002712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276561441 + 895445776 = 35729^2 + 29924^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172007217 - 2⁶ = 2172007153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2172007217.

It is not a weakly prime, because it can be changed into another prime (2172001217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086003608 + 1086003609.

It is an arithmetic number, because the mean of its divisors is an integer number (1086003609).

Almost surely, 2^2172007217 is an apocalyptic number.

It is an amenable number.

2172007217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172007217 is an equidigital number, since it uses as much as digits as its factorization.

2172007217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 2172007217 is about 46604.7982186384. The cubic root of 2172007217 is about 1295.0516453517.

Adding to 2172007217 its reverse (7127002712), we get a palindrome (9299009929).

The spelling of 2172007217 in words is "two billion, one hundred seventy-two million, seven thousand, two hundred seventeen".