1212220221211 has 4 divisors (see below), whose sum is σ = 1212225122992. Its totient is φ = 1212215319432.

The previous prime is 1212220221181. The next prime is 1212220221217. The reversal of 1212220221211 is 1121220222121.

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 1212220221211 - 2²⁹ = 1211683350299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212220221217) 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, 2059056 + ... + 2581501.

It is an arithmetic number, because the mean of its divisors is an integer number (303056280748).

Almost surely, 2^{1212220221211} is an apocalyptic number.

1212220221211 is a deficient number, since it is larger than the sum of its proper divisors (4901781).

1212220221211 is an equidigital number, since it uses as much as digits as its factorization.

1212220221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4901780.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212220221211 its reverse (1121220222121), we get a palindrome (2333440443332).

The spelling of 1212220221211 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty-one thousand, two hundred eleven".