2106221206 has 4 divisors (see below), whose sum is σ = 3159331812. Its totient is φ = 1053110602.

The previous prime is 2106221203. The next prime is 2106221261. The reversal of 2106221206 is 6021226012.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 526555300 + ... + 526555303.

It is an arithmetic number, because the mean of its divisors is an integer number (789832953).

Almost surely, 2^2106221206 is an apocalyptic number.

2106221206 is a deficient number, since it is larger than the sum of its proper divisors (1053110606).

2106221206 is a wasteful number, since it uses less digits than its factorization.

2106221206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053110605.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2106221206 is about 45893.5856738172. The cubic root of 2106221206 is about 1281.8424812732.

Adding to 2106221206 its reverse (6021226012), we get a palindrome (8127447218).

The spelling of 2106221206 in words is "two billion, one hundred six million, two hundred twenty-one thousand, two hundred six".