1211211222211 has 8 divisors (see below), whose sum is σ = 1212164905104. Its totient is φ = 1210257750240.

The previous prime is 1211211222161. The next prime is 1211211222233. The reversal of 1211211222211 is 1122221121121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211211222211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211211222251) 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, 12618981 + ... + 12714601.

It is an arithmetic number, because the mean of its divisors is an integer number (151520613138).

Almost surely, 2^{1211211222211} is an apocalyptic number.

1211211222211 is a deficient number, since it is larger than the sum of its proper divisors (953682893).

1211211222211 is an equidigital number, since it uses as much as digits as its factorization.

1211211222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105461.

The product of its digits is 64, while the sum is 19.

Adding to 1211211222211 its reverse (1122221121121), we get a palindrome (2333432343332).

The spelling of 1211211222211 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, two hundred eleven".