2106221204 has 12 divisors (see below), whose sum is σ = 3687233844. Its totient is φ = 1052725824.

The previous prime is 2106221203. The next prime is 2106221261. The reversal of 2106221204 is 4021226012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 803155600 + 1303065604 = 28340^2 + 36098^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 83699 + ... + 105914.

It is an arithmetic number, because the mean of its divisors is an integer number (307269487).

Almost surely, 2^2106221204 is an apocalyptic number.

It is an amenable number.

2106221204 is a deficient number, since it is larger than the sum of its proper divisors (1581012640).

2106221204 is a wasteful number, since it uses less digits than its factorization.

2106221204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192394 (or 192392 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2106221204 is about 45893.5856520277. The cubic root of 2106221204 is about 1281.8424808675.

Adding to 2106221204 its reverse (4021226012), we get a palindrome (6127447216).

The spelling of 2106221204 in words is "two billion, one hundred six million, two hundred twenty-one thousand, two hundred four".