216852087217 has 2 divisors, whose sum is σ = 216852087218. Its totient is φ = 216852087216.

The previous prime is 216852087211. The next prime is 216852087233. The reversal of 216852087217 is 712780258612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138312585216 + 78539502001 = 371904^2 + 280249^2 .

It is a cyclic number.

It is not a de Polignac number, because 216852087217 - 2¹¹ = 216852085169 is a prime.

It is not a weakly prime, because it can be changed into another prime (216852087211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108426043608 + 108426043609.

It is an arithmetic number, because the mean of its divisors is an integer number (108426043609).

Almost surely, 2^216852087217 is an apocalyptic number.

It is an amenable number.

216852087217 is a deficient number, since it is larger than the sum of its proper divisors (1).

216852087217 is an equidigital number, since it uses as much as digits as its factorization.

216852087217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 216852087217 in words is "two hundred sixteen billion, eight hundred fifty-two million, eighty-seven thousand, two hundred seventeen".