2166216211 has 16 divisors (see below), whose sum is σ = 2339020800. Its totient is φ = 1998648448.

The previous prime is 2166216197. The next prime is 2166216257. The reversal of 2166216211 is 1126126612.

It is a cyclic number.

It is not a de Polignac number, because 2166216211 - 2⁷ = 2166216083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166216211.

It is not an unprimeable number, because it can be changed into a prime (2166216271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381330 + ... + 386968.

It is an arithmetic number, because the mean of its divisors is an integer number (146188800).

Almost surely, 2^2166216211 is an apocalyptic number.

2166216211 is a deficient number, since it is larger than the sum of its proper divisors (172804589).

2166216211 is a wasteful number, since it uses less digits than its factorization.

2166216211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6098.

The product of its digits is 1728, while the sum is 28.

The square root of 2166216211 is about 46542.6278909990. The cubic root of 2166216211 is about 1293.8996653044.

It can be divided in two parts, 21662 and 16211, that added together give a palindrome (37873).

The spelling of 2166216211 in words is "two billion, one hundred sixty-six million, two hundred sixteen thousand, two hundred eleven".