211230221 has 2 divisors, whose sum is σ = 211230222. Its totient is φ = 211230220.

The previous prime is 211230199. The next prime is 211230247. The reversal of 211230221 is 122032112.

It is a happy number.

211230221 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., 158508100 + 52722121 = 12590^2 + 7261^2 .

It is a cyclic number.

It is not a de Polignac number, because 211230221 - 2⁶ = 211230157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211230196 and 211230205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211233221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615110 + 105615111.

It is an arithmetic number, because the mean of its divisors is an integer number (105615111).

Almost surely, 2^211230221 is an apocalyptic number.

It is an amenable number.

211230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211230221 is an equidigital number, since it uses as much as digits as its factorization.

211230221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 211230221 is about 14533.7614195362. The cubic root of 211230221 is about 595.5506246201.

Adding to 211230221 its reverse (122032112), we get a palindrome (333262333).

The spelling of 211230221 in words is "two hundred eleven million, two hundred thirty thousand, two hundred twenty-one".