2162445221 has 2 divisors, whose sum is σ = 2162445222. Its totient is φ = 2162445220.

The previous prime is 2162445199. The next prime is 2162445281. The reversal of 2162445221 is 1225442612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485717025 + 676728196 = 38545^2 + 26014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2162445221 - 2¹⁸ = 2162183077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2162445281) 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 as a sum of consecutive naturals, namely, 1081222610 + 1081222611.

It is an arithmetic number, because the mean of its divisors is an integer number (1081222611).

Almost surely, 2^2162445221 is an apocalyptic number.

It is an amenable number.

2162445221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2162445221 is an equidigital number, since it uses as much as digits as its factorization.

2162445221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 29.

The square root of 2162445221 is about 46502.0991031588. The cubic root of 2162445221 is about 1293.1484142318.

Adding to 2162445221 its reverse (1225442612), we get a palindrome (3387887833).

The spelling of 2162445221 in words is "two billion, one hundred sixty-two million, four hundred forty-five thousand, two hundred twenty-one".