1221213320213 has 2 divisors, whose sum is σ = 1221213320214. Its totient is φ = 1221213320212.

The previous prime is 1221213320191. The next prime is 1221213320279. The reversal of 1221213320213 is 3120233121221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055647337809 + 165565982404 = 1027447^2 + 406898^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221213320213 - 2¹⁸ = 1221213058069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221213320113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606660106 + 610606660107.

It is an arithmetic number, because the mean of its divisors is an integer number (610606660107).

Almost surely, 2^{1221213320213} is an apocalyptic number.

It is an amenable number.

1221213320213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221213320213 is an equidigital number, since it uses as much as digits as its factorization.

1221213320213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221213320213 its reverse (3120233121221), we get a palindrome (4341446441434).

The spelling of 1221213320213 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred thirteen".