221642224213 has 2 divisors, whose sum is σ = 221642224214. Its totient is φ = 221642224212.

The previous prime is 221642224211. The next prime is 221642224231. The reversal of 221642224213 is 312422246122.

It is a happy number.

Together with next prime (221642224231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117592754724 + 104049469489 = 342918^2 + 322567^2 .

It is a cyclic number.

It is not a de Polignac number, because 221642224213 - 2¹ = 221642224211 is a prime.

Together with 221642224211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221642224211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110821112106 + 110821112107.

It is an arithmetic number, because the mean of its divisors is an integer number (110821112107).

Almost surely, 2^221642224213 is an apocalyptic number.

It is an amenable number.

221642224213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221642224213 is an equidigital number, since it uses as much as digits as its factorization.

221642224213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 31.

The spelling of 221642224213 in words is "two hundred twenty-one billion, six hundred forty-two million, two hundred twenty-four thousand, two hundred thirteen".