1213111221211 has 2 divisors, whose sum is σ = 1213111221212. Its totient is φ = 1213111221210.

The previous prime is 1213111221199. The next prime is 1213111221221. The reversal of 1213111221211 is 1121221113121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213111221211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213111221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606555610605 + 606555610606.

It is an arithmetic number, because the mean of its divisors is an integer number (606555610606).

Almost surely, 2^{1213111221211} is an apocalyptic number.

1213111221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213111221211 is an equidigital number, since it uses as much as digits as its factorization.

1213111221211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 19.

Adding to 1213111221211 its reverse (1121221113121), we get a palindrome (2334332334332).

The spelling of 1213111221211 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, two hundred twenty-one thousand, two hundred eleven".