221800213 has 2 divisors, whose sum is σ = 221800214. Its totient is φ = 221800212.

The previous prime is 221800211. The next prime is 221800219. The reversal of 221800213 is 312008122.

221800213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191351889 + 30448324 = 13833^2 + 5518^2 .

It is a cyclic number.

It is not a de Polignac number, because 221800213 - 2¹ = 221800211 is a prime.

Together with 221800211, 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 (221800211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110900106 + 110900107.

It is an arithmetic number, because the mean of its divisors is an integer number (110900107).

Almost surely, 2^221800213 is an apocalyptic number.

It is an amenable number.

221800213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221800213 is an equidigital number, since it uses as much as digits as its factorization.

221800213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 221800213 is about 14892.9585039374. The cubic root of 221800213 is about 605.3232004863.

Adding to 221800213 its reverse (312008122), we get a palindrome (533808335).

The spelling of 221800213 in words is "two hundred twenty-one million, eight hundred thousand, two hundred thirteen".