1212112220009 has 8 divisors (see below), whose sum is σ = 1213019987400. Its totient is φ = 1211204749696.

The previous prime is 1212112219999. The next prime is 1212112220063. The reversal of 1212112220009 is 9000222112121.

It can be written as a sum of positive squares in 4 ways, for example, as 755639025625 + 456473194384 = 869275^2 + 675628^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212112220009 - 2²⁰ = 1212111171433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212112280009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8451869 + ... + 8594085.

It is an arithmetic number, because the mean of its divisors is an integer number (151627498425).

Almost surely, 2^{1212112220009} is an apocalyptic number.

It is an amenable number.

1212112220009 is a deficient number, since it is larger than the sum of its proper divisors (907767391).

1212112220009 is a wasteful number, since it uses less digits than its factorization.

1212112220009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148539.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1212112220009 in words is "one trillion, two hundred twelve billion, one hundred twelve million, two hundred twenty thousand, nine".