2111221205 has 8 divisors (see below), whose sum is σ = 2537043000. Its totient is φ = 1686591936.

The previous prime is 2111221193. The next prime is 2111221207. The reversal of 2111221205 is 5021221112.

It can be written as a sum of positive squares in 4 ways, for example, as 200307409 + 1910913796 = 14153^2 + 43714^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2111221205 - 2¹⁸ = 2110959061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111221207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294230 + ... + 301319.

It is an arithmetic number, because the mean of its divisors is an integer number (317130375).

Almost surely, 2^2111221205 is an apocalyptic number.

It is an amenable number.

2111221205 is a deficient number, since it is larger than the sum of its proper divisors (425821795).

2111221205 is an equidigital number, since it uses as much as digits as its factorization.

2111221205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596263.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2111221205 is about 45948.0272155400. The cubic root of 2111221205 is about 1282.8560098514.

Adding to 2111221205 its reverse (5021221112), we get a palindrome (7132442317).

The spelling of 2111221205 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred five".