2213122321 has 4 divisors (see below), whose sum is σ = 2218233892. Its totient is φ = 2208010752.
The previous prime is 2213122297. The next prime is 2213122349. The reversal of 2213122321 is 1232213122.
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 454158721 + 1758963600 = 21311^2 + 41940^2 .
It is a cyclic number.
It is not a de Polignac number, because 2213122321 - 225 = 2179567889 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2213122621) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2555136 + ... + 2556001.
It is an arithmetic number, because the mean of its divisors is an integer number (554558473).
Almost surely, 22213122321 is an apocalyptic number.
It is an amenable number.
2213122321 is a deficient number, since it is larger than the sum of its proper divisors (5111571).
2213122321 is an equidigital number, since it uses as much as digits as its factorization.
2213122321 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5111570.
The product of its digits is 288, while the sum is 19.
The square root of 2213122321 is about 47043.8340380543. The cubic root of 2213122321 is about 1303.1721980279.
Adding to 2213122321 its reverse (1232213122), we get a palindrome (3445335443).
The spelling of 2213122321 in words is "two billion, two hundred thirteen million, one hundred twenty-two thousand, three hundred twenty-one".
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