1212212020209 has 4 divisors (see below), whose sum is σ = 1616282693616. Its totient is φ = 808141346804.

The previous prime is 1212212020183. The next prime is 1212212020277. The reversal of 1212212020209 is 9020202122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212212020209 - 2¹³ = 1212212012017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212212040209) 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 3 ways as a sum of consecutive naturals, for example, 202035336699 + ... + 202035336704.

It is an arithmetic number, because the mean of its divisors is an integer number (404070673404).

Almost surely, 2^{1212212020209} is an apocalyptic number.

It is an amenable number.

1212212020209 is a deficient number, since it is larger than the sum of its proper divisors (404070673407).

1212212020209 is an equidigital number, since it uses as much as digits as its factorization.

1212212020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404070673406.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 1212212020209 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twenty thousand, two hundred nine".