213223113221 has 2 divisors, whose sum is σ = 213223113222. Its totient is φ = 213223113220.

The previous prime is 213223113211. The next prime is 213223113227. The reversal of 213223113221 is 122311322312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115947741121 + 97275372100 = 340511^2 + 311890^2 .

It is a cyclic number.

It is not a de Polignac number, because 213223113221 - 2³⁰ = 212149371397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213223113227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106611556610 + 106611556611.

It is an arithmetic number, because the mean of its divisors is an integer number (106611556611).

Almost surely, 2^213223113221 is an apocalyptic number.

It is an amenable number.

213223113221 is a deficient number, since it is larger than the sum of its proper divisors (1).

213223113221 is an equidigital number, since it uses as much as digits as its factorization.

213223113221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 213223113221 its reverse (122311322312), we get a palindrome (335534435533).

The spelling of 213223113221 in words is "two hundred thirteen billion, two hundred twenty-three million, one hundred thirteen thousand, two hundred twenty-one".