212021300321 has 2 divisors, whose sum is σ = 212021300322. Its totient is φ = 212021300320.

The previous prime is 212021300317. The next prime is 212021300357. The reversal of 212021300321 is 123003120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148398300625 + 63622999696 = 385225^2 + 252236^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021300321 - 2² = 212021300317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212021300321.

It is not a weakly prime, because it can be changed into another prime (212021300021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010650160 + 106010650161.

It is an arithmetic number, because the mean of its divisors is an integer number (106010650161).

Almost surely, 2^212021300321 is an apocalyptic number.

It is an amenable number.

212021300321 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021300321 is an equidigital number, since it uses as much as digits as its factorization.

212021300321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 212021300321 its reverse (123003120212), we get a palindrome (335024420533).

The spelling of 212021300321 in words is "two hundred twelve billion, twenty-one million, three hundred thousand, three hundred twenty-one".