2106571217 has 2 divisors, whose sum is σ = 2106571218. Its totient is φ = 2106571216.

The previous prime is 2106571193. The next prime is 2106571237. The reversal of 2106571217 is 7121756012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1925103376 + 181467841 = 43876^2 + 13471^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106571217 - 2²⁴ = 2089794001 is a prime.

It is a super-2 number, since 2×2106571217² = 8875284584585722178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2106571237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053285608 + 1053285609.

It is an arithmetic number, because the mean of its divisors is an integer number (1053285609).

Almost surely, 2^2106571217 is an apocalyptic number.

It is an amenable number.

2106571217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106571217 is an equidigital number, since it uses as much as digits as its factorization.

2106571217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 2106571217 is about 45897.3988042896. The cubic root of 2106571217 is about 1281.9134826978.

The spelling of 2106571217 in words is "two billion, one hundred six million, five hundred seventy-one thousand, two hundred seventeen".