1213554243211 has 2 divisors, whose sum is σ = 1213554243212. Its totient is φ = 1213554243210.

The previous prime is 1213554243197. The next prime is 1213554243227. The reversal of 1213554243211 is 1123424553121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213554243211 - 2⁵ = 1213554243179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213554243311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606777121605 + 606777121606.

It is an arithmetic number, because the mean of its divisors is an integer number (606777121606).

Almost surely, 2^{1213554243211} is an apocalyptic number.

1213554243211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213554243211 is an equidigital number, since it uses as much as digits as its factorization.

1213554243211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

Adding to 1213554243211 its reverse (1123424553121), we get a palindrome (2336978796332).

The spelling of 1213554243211 in words is "one trillion, two hundred thirteen billion, five hundred fifty-four million, two hundred forty-three thousand, two hundred eleven".