1212122009999 has 4 divisors (see below), whose sum is σ = 1212904530600. Its totient is φ = 1211339489400.

The previous prime is 1212122009977. The next prime is 1212122010007. The reversal of 1212122009999 is 9999002212121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212122009999 - 2²⁰ = 1212120961423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212122009909) 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 3 ways as a sum of consecutive naturals, for example, 391257977 + ... + 391261074.

It is an arithmetic number, because the mean of its divisors is an integer number (303226132650).

Almost surely, 2^{1212122009999} is an apocalyptic number.

1212122009999 is a deficient number, since it is larger than the sum of its proper divisors (782520601).

1212122009999 is an equidigital number, since it uses as much as digits as its factorization.

1212122009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782520600.

The product of its (nonzero) digits is 104976, while the sum is 47.

The spelling of 1212122009999 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, nine thousand, nine hundred ninety-nine".