212031330221 has 2 divisors, whose sum is σ = 212031330222. Its totient is φ = 212031330220.

The previous prime is 212031330211. The next prime is 212031330227. The reversal of 212031330221 is 122033130212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204587954596 + 7443375625 = 452314^2 + 86275^2 .

It is a cyclic number.

It is not a de Polignac number, because 212031330221 - 2¹⁰ = 212031329197 is a prime.

It is a super-3 number, since 3×212031330221³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212031330193 and 212031330202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212031330227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106015665110 + 106015665111.

It is an arithmetic number, because the mean of its divisors is an integer number (106015665111).

Almost surely, 2^212031330221 is an apocalyptic number.

It is an amenable number.

212031330221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212031330221 is an equidigital number, since it uses as much as digits as its factorization.

212031330221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 212031330221 its reverse (122033130212), we get a palindrome (334064460433).

Subtracting from 212031330221 its reverse (122033130212), we obtain a square (89998200009 = 299997²).

The spelling of 212031330221 in words is "two hundred twelve billion, thirty-one million, three hundred thirty thousand, two hundred twenty-one".