2102787217 has 2 divisors, whose sum is σ = 2102787218. Its totient is φ = 2102787216.

The previous prime is 2102787173. The next prime is 2102787223. The reversal of 2102787217 is 7127872012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1934592256 + 168194961 = 43984^2 + 12969^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102787217 - 2¹¹ = 2102785169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2102787227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051393608 + 1051393609.

It is an arithmetic number, because the mean of its divisors is an integer number (1051393609).

Almost surely, 2^2102787217 is an apocalyptic number.

It is an amenable number.

2102787217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102787217 is an equidigital number, since it uses as much as digits as its factorization.

2102787217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21952, while the sum is 37.

The square root of 2102787217 is about 45856.1578961866. The cubic root of 2102787217 is about 1281.1454624621.

The spelling of 2102787217 in words is "two billion, one hundred two million, seven hundred eighty-seven thousand, two hundred seventeen".