1213221323209 has 24 divisors (see below), whose sum is σ = 1487239990848. Its totient is φ = 984842258400.

The previous prime is 1213221323203. The next prime is 1213221323233. The reversal of 1213221323209 is 9023231223121.

It is not a de Polignac number, because 1213221323209 - 2⁵ = 1213221323177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213221323203) 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 in 23 ways as a sum of consecutive naturals, for example, 5215407 + ... + 5443060.

It is an arithmetic number, because the mean of its divisors is an integer number (61968332952).

Almost surely, 2^{1213221323209} is an apocalyptic number.

It is an amenable number.

1213221323209 is a deficient number, since it is larger than the sum of its proper divisors (274018667639).

1213221323209 is a wasteful number, since it uses less digits than its factorization.

1213221323209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658605 (or 10658598 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 1213221323209 in words is "one trillion, two hundred thirteen billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred nine".