1212011232209 has 4 divisors (see below), whose sum is σ = 1221263226480. Its totient is φ = 1202759237940.

The previous prime is 1212011232203. The next prime is 1212011232233. The reversal of 1212011232209 is 9022321102121.

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 a de Polignac number, because none of the positive numbers 2^k-1212011232209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212011232203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4625996939 + ... + 4625997200.

It is an arithmetic number, because the mean of its divisors is an integer number (305315806620).

Almost surely, 2^{1212011232209} is an apocalyptic number.

It is an amenable number.

1212011232209 is a deficient number, since it is larger than the sum of its proper divisors (9251994271).

1212011232209 is an equidigital number, since it uses as much as digits as its factorization.

1212011232209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9251994270.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 1212011232209 in words is "one trillion, two hundred twelve billion, eleven million, two hundred thirty-two thousand, two hundred nine".