211021330321 has 2 divisors, whose sum is σ = 211021330322. Its totient is φ = 211021330320.

The previous prime is 211021330319. The next prime is 211021330337. The reversal of 211021330321 is 123033120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151446283921 + 59575046400 = 389161^2 + 244080^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021330321 - 2¹ = 211021330319 is a prime.

Together with 211021330319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211021330301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510665160 + 105510665161.

It is an arithmetic number, because the mean of its divisors is an integer number (105510665161).

Almost surely, 2^211021330321 is an apocalyptic number.

It is an amenable number.

211021330321 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021330321 is an equidigital number, since it uses as much as digits as its factorization.

211021330321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211021330321 its reverse (123033120112), we get a palindrome (334054450433).

The spelling of 211021330321 in words is "two hundred eleven billion, twenty-one million, three hundred thirty thousand, three hundred twenty-one".