2211221213 has 4 divisors (see below), whose sum is σ = 2211433980. Its totient is φ = 2211008448.

The previous prime is 2211221209. The next prime is 2211221249. The reversal of 2211221213 is 3121221122.

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 1241646169 + 969575044 = 35237^2 + 31138^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211221213 - 2² = 2211221209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211221191 and 2211221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211221113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89948 + ... + 111861.

It is an arithmetic number, because the mean of its divisors is an integer number (552858495).

Almost surely, 2^2211221213 is an apocalyptic number.

It is an amenable number.

2211221213 is a deficient number, since it is larger than the sum of its proper divisors (212767).

2211221213 is a wasteful number, since it uses less digits than its factorization.

2211221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212766.

The product of its digits is 96, while the sum is 17.

The square root of 2211221213 is about 47023.6239883742. The cubic root of 2211221213 is about 1302.7989424390.

Adding to 2211221213 its reverse (3121221122), we get a palindrome (5332442335).

Subtracting 2211221213 from its reverse (3121221122), we obtain a palindrome (909999909).

The spelling of 2211221213 in words is "two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred thirteen".