221211311224213 has 2 divisors, whose sum is σ = 221211311224214. Its totient is φ = 221211311224212.

The previous prime is 221211311224157. The next prime is 221211311224229. The reversal of 221211311224213 is 312422113112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219367587189969 + 1843724034244 = 14811063^2 + 1357838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211311224213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211311224613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605655612106 + 110605655612107.

It is an arithmetic number, because the mean of its divisors is an integer number (110605655612107).

Almost surely, 2^{221211311224213} is an apocalyptic number.

It is an amenable number.

221211311224213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211311224213 is an equidigital number, since it uses as much as digits as its factorization.

221211311224213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

Adding to 221211311224213 its reverse (312422113112122), we get a palindrome (533633424336335).

The spelling of 221211311224213 in words is "two hundred twenty-one trillion, two hundred eleven billion, three hundred eleven million, two hundred twenty-four thousand, two hundred thirteen".