211221322020353 has 2 divisors, whose sum is σ = 211221322020354. Its totient is φ = 211221322020352.

The previous prime is 211221322020223. The next prime is 211221322020409. The reversal of 211221322020353 is 353020223122112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133646940572929 + 77574381447424 = 11560577^2 + 8807632^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221322020353 - 2²² = 211221317826049 is a prime.

It is a super-2 number, since 2×211221322020353² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211221322020853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610661010176 + 105610661010177.

It is an arithmetic number, because the mean of its divisors is an integer number (105610661010177).

Almost surely, 2^{211221322020353} is an apocalyptic number.

It is an amenable number.

211221322020353 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221322020353 is an equidigital number, since it uses as much as digits as its factorization.

211221322020353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 211221322020353 its reverse (353020223122112), we get a palindrome (564241545142465).

The spelling of 211221322020353 in words is "two hundred eleven trillion, two hundred twenty-one billion, three hundred twenty-two million, twenty thousand, three hundred fifty-three".