2166221206 has 8 divisors (see below), whose sum is σ = 3279699720. Its totient is φ = 1072987968.

The previous prime is 2166221177. The next prime is 2166221219. The reversal of 2166221206 is 6021226612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5061051 + ... + 5061478.

It is an arithmetic number, because the mean of its divisors is an integer number (409962465).

Almost surely, 2^2166221206 is an apocalyptic number.

2166221206 is a deficient number, since it is larger than the sum of its proper divisors (1113478514).

2166221206 is a wasteful number, since it uses less digits than its factorization.

2166221206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10122638.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 2166221206 is about 46542.6815514534. The cubic root of 2166221206 is about 1293.9006598225.

Adding to 2166221206 its reverse (6021226612), we get a palindrome (8187447818).

The spelling of 2166221206 in words is "two billion, one hundred sixty-six million, two hundred twenty-one thousand, two hundred six".