2216566662021 has 12 divisors (see below), whose sum is σ = 3245566407148. Its totient is φ = 1457468489664.

The previous prime is 2216566662019. The next prime is 2216566662047. The reversal of 2216566662021 is 1202666656122.

It can be written as a sum of positive squares in 2 ways, for example, as 1705077077796 + 511489584225 = 1305786^2 + 715185^2 .

It is not a de Polignac number, because 2216566662021 - 2¹ = 2216566662019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216566662091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1686884170 + ... + 1686885483.

Almost surely, 2^{2216566662021} is an apocalyptic number.

It is an amenable number.

2216566662021 is a deficient number, since it is larger than the sum of its proper divisors (1028999745127).

2216566662021 is a wasteful number, since it uses less digits than its factorization.

2216566662021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373769732 (or 3373769729 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 2216566662021 in words is "two trillion, two hundred sixteen billion, five hundred sixty-six million, six hundred sixty-two thousand, twenty-one".