1212211221211 has 8 divisors (see below), whose sum is σ = 1256685266304. Its totient is φ = 1168072829760.

The previous prime is 1212211221197. The next prime is 1212211221223. The reversal of 1212211221211 is 1121221122121.

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 not a de Polignac number, because 1212211221211 - 2⁹ = 1212211220699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212211221251) 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 7 ways as a sum of consecutive naturals, for example, 83906056 + ... + 83920501.

It is an arithmetic number, because the mean of its divisors is an integer number (157085658288).

Almost surely, 2^{1212211221211} is an apocalyptic number.

1212211221211 is a deficient number, since it is larger than the sum of its proper divisors (44474045093).

1212211221211 is a wasteful number, since it uses less digits than its factorization.

1212211221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167826821.

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

Adding to 1212211221211 its reverse (1121221122121), we get a palindrome (2333432343332).

The spelling of 1212211221211 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".