1212211220197 has 2 divisors, whose sum is σ = 1212211220198. Its totient is φ = 1212211220196.

The previous prime is 1212211220191. The next prime is 1212211220251. The reversal of 1212211220197 is 7910221122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1030791447841 + 181419772356 = 1015279^2 + 425934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212211220197 - 2¹¹ = 1212211218149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212211220191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105610098 + 606105610099.

It is an arithmetic number, because the mean of its divisors is an integer number (606105610099).

Almost surely, 2^{1212211220197} is an apocalyptic number.

It is an amenable number.

1212211220197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211220197 is an equidigital number, since it uses as much as digits as its factorization.

1212211220197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 1212211220197 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty thousand, one hundred ninety-seven".