2101656217 has 2 divisors, whose sum is σ = 2101656218. Its totient is φ = 2101656216.

The previous prime is 2101656173. The next prime is 2101656281. The reversal of 2101656217 is 7126561012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2070341001 + 31315216 = 45501^2 + 5596^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101656217 - 2¹⁵ = 2101623449 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101656017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050828108 + 1050828109.

It is an arithmetic number, because the mean of its divisors is an integer number (1050828109).

Almost surely, 2^2101656217 is an apocalyptic number.

It is an amenable number.

2101656217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101656217 is an equidigital number, since it uses as much as digits as its factorization.

2101656217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2101656217 is about 45843.8241969406. The cubic root of 2101656217 is about 1280.9157300122.

The spelling of 2101656217 in words is "two billion, one hundred one million, six hundred fifty-six thousand, two hundred seventeen".