2101222105 has 4 divisors (see below), whose sum is σ = 2521466532. Its totient is φ = 1680977680.

The previous prime is 2101222087. The next prime is 2101222111. The reversal of 2101222105 is 5012221012.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 612265536 + 1488956569 = 24744^2 + 38587^2 .

It is not a de Polignac number, because 2101222105 - 2¹¹ = 2101220057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210122206 + ... + 210122215.

It is an arithmetic number, because the mean of its divisors is an integer number (630366633).

Almost surely, 2^2101222105 is an apocalyptic number.

It is an amenable number.

2101222105 is a deficient number, since it is larger than the sum of its proper divisors (420244427).

2101222105 is an equidigital number, since it uses as much as digits as its factorization.

2101222105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420244426.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2101222105 is about 45839.0892688762. The cubic root of 2101222105 is about 1280.8275298624.

Adding to 2101222105 its reverse (5012221012), we get a palindrome (7113443117).

The spelling of 2101222105 in words is "two billion, one hundred one million, two hundred twenty-two thousand, one hundred five".