2213271805 has 4 divisors (see below), whose sum is σ = 2655926172. Its totient is φ = 1770617440.

The previous prime is 2213271773. The next prime is 2213271811. The reversal of 2213271805 is 5081723122.

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 265461849 + 1947809956 = 16293^2 + 44134^2 .

It is not a de Polignac number, because 2213271805 - 2⁵ = 2213271773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221327176 + ... + 221327185.

It is an arithmetic number, because the mean of its divisors is an integer number (663981543).

Almost surely, 2^2213271805 is an apocalyptic number.

It is an amenable number.

2213271805 is a deficient number, since it is larger than the sum of its proper divisors (442654367).

2213271805 is an equidigital number, since it uses as much as digits as its factorization.

2213271805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442654366.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 2213271805 is about 47045.4227847938. The cubic root of 2213271805 is about 1303.2015380249.

Adding to 2213271805 its reverse (5081723122), we get a palindrome (7294994927).

The spelling of 2213271805 in words is "two billion, two hundred thirteen million, two hundred seventy-one thousand, eight hundred five".