1221918587333 has 2 divisors, whose sum is σ = 1221918587334. Its totient is φ = 1221918587332.

The previous prime is 1221918587299. The next prime is 1221918587401. The reversal of 1221918587333 is 3337858191221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 910846910689 + 311071676644 = 954383^2 + 557738^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221918587333 - 2²⁰ = 1221917538757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221918587633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610959293666 + 610959293667.

It is an arithmetic number, because the mean of its divisors is an integer number (610959293667).

Almost surely, 2^{1221918587333} is an apocalyptic number.

It is an amenable number.

1221918587333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221918587333 is an equidigital number, since it uses as much as digits as its factorization.

1221918587333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 53.

The spelling of 1221918587333 in words is "one trillion, two hundred twenty-one billion, nine hundred eighteen million, five hundred eighty-seven thousand, three hundred thirty-three".