2211561217 has 2 divisors, whose sum is σ = 2211561218. Its totient is φ = 2211561216.

The previous prime is 2211561181. The next prime is 2211561223. The reversal of 2211561217 is 7121651122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2061523216 + 150038001 = 45404^2 + 12249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211561217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2211565217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105780608 + 1105780609.

It is an arithmetic number, because the mean of its divisors is an integer number (1105780609).

Almost surely, 2^2211561217 is an apocalyptic number.

It is an amenable number.

2211561217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211561217 is an equidigital number, since it uses as much as digits as its factorization.

2211561217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 2211561217 is about 47027.2390960813. The cubic root of 2211561217 is about 1302.8657131066.

The spelling of 2211561217 in words is "two billion, two hundred eleven million, five hundred sixty-one thousand, two hundred seventeen".