221322313213 has 2 divisors, whose sum is σ = 221322313214. Its totient is φ = 221322313212.

The previous prime is 221322313207. The next prime is 221322313237. The reversal of 221322313213 is 312313223122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125629840249 + 95692472964 = 354443^2 + 309342^2 .

It is a cyclic number.

It is not a de Polignac number, because 221322313213 - 2²⁵ = 221288758781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221322313253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661156606 + 110661156607.

It is an arithmetic number, because the mean of its divisors is an integer number (110661156607).

Almost surely, 2^221322313213 is an apocalyptic number.

It is an amenable number.

221322313213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221322313213 is an equidigital number, since it uses as much as digits as its factorization.

221322313213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 25.

Adding to 221322313213 its reverse (312313223122), we get a palindrome (533635536335).

Subtracting 221322313213 from its reverse (312313223122), we obtain a palindrome (90990909909).

The spelling of 221322313213 in words is "two hundred twenty-one billion, three hundred twenty-two million, three hundred thirteen thousand, two hundred thirteen".