212221210133 has 2 divisors, whose sum is σ = 212221210134. Its totient is φ = 212221210132.

The previous prime is 212221210129. The next prime is 212221210139. The reversal of 212221210133 is 331012122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171335561329 + 40885648804 = 413927^2 + 202202^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221210133 - 2² = 212221210129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212221210139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110605066 + 106110605067.

It is an arithmetic number, because the mean of its divisors is an integer number (106110605067).

Almost surely, 2^212221210133 is an apocalyptic number.

It is an amenable number.

212221210133 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221210133 is an equidigital number, since it uses as much as digits as its factorization.

212221210133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 212221210133 its reverse (331012122212), we get a palindrome (543233332345).

The spelling of 212221210133 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred thirty-three".