2213043821 has 2 divisors, whose sum is σ = 2213043822. Its totient is φ = 2213043820.

The previous prime is 2213043817. The next prime is 2213043883. The reversal of 2213043821 is 1283403122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2152032100 + 61011721 = 46390^2 + 7811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2213043821 - 2² = 2213043817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2213048821) 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 as a sum of consecutive naturals, namely, 1106521910 + 1106521911.

It is an arithmetic number, because the mean of its divisors is an integer number (1106521911).

Almost surely, 2^2213043821 is an apocalyptic number.

It is an amenable number.

2213043821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2213043821 is an equidigital number, since it uses as much as digits as its factorization.

2213043821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 2213043821 is about 47042.9997023999. Note that the first 3 decimals coincide. The cubic root of 2213043821 is about 1303.1567898982.

Adding to 2213043821 its reverse (1283403122), we get a palindrome (3496446943).

The spelling of 2213043821 in words is "two billion, two hundred thirteen million, forty-three thousand, eight hundred twenty-one".