1212212201209 has 16 divisors (see below), whose sum is σ = 1247407696080. Its totient is φ = 1177287229440.

The previous prime is 1212212201203. The next prime is 1212212201219. The reversal of 1212212201209 is 9021022122121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 111737769984 + 1100474431225 = 334272^2 + 1049035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212212201209 - 2²⁹ = 1211675330297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212212201203) 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 in 15 ways as a sum of consecutive naturals, for example, 47456089 + ... + 47481625.

It is an arithmetic number, because the mean of its divisors is an integer number (77962981005).

Almost surely, 2^{1212212201209} is an apocalyptic number.

It is an amenable number.

1212212201209 is a deficient number, since it is larger than the sum of its proper divisors (35195494871).

1212212201209 is a wasteful number, since it uses less digits than its factorization.

1212212201209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30780.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 1212212201209 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred one thousand, two hundred nine".