21311303213201 has 2 divisors, whose sum is σ = 21311303213202. Its totient is φ = 21311303213200.

The previous prime is 21311303213147. The next prime is 21311303213261. The reversal of 21311303213201 is 10231230311312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17985877432576 + 3325425780625 = 4240976^2 + 1823575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311303213201 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21311303213261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655651606600 + 10655651606601.

It is an arithmetic number, because the mean of its divisors is an integer number (10655651606601).

Almost surely, 2^{21311303213201} is an apocalyptic number.

It is an amenable number.

21311303213201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311303213201 is an equidigital number, since it uses as much as digits as its factorization.

21311303213201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21311303213201 its reverse (10231230311312), we get a palindrome (31542533524513).

The spelling of 21311303213201 in words is "twenty-one trillion, three hundred eleven billion, three hundred three million, two hundred thirteen thousand, two hundred one".