221211134213 has 2 divisors, whose sum is σ = 221211134214. Its totient is φ = 221211134212.

The previous prime is 221211134171. The next prime is 221211134231. The reversal of 221211134213 is 312431112122.

Together with next prime (221211134231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141344417764 + 79866716449 = 375958^2 + 282607^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211134213 - 2¹⁰ = 221211133189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211134293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605567106 + 110605567107.

It is an arithmetic number, because the mean of its divisors is an integer number (110605567107).

Almost surely, 2^221211134213 is an apocalyptic number.

It is an amenable number.

221211134213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211134213 is an equidigital number, since it uses as much as digits as its factorization.

221211134213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 221211134213 its reverse (312431112122), we get a palindrome (533642246335).

The spelling of 221211134213 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thirty-four thousand, two hundred thirteen".