1221113112311 has 2 divisors, whose sum is σ = 1221113112312. Its totient is φ = 1221113112310.

The previous prime is 1221113112283. The next prime is 1221113112383. The reversal of 1221113112311 is 1132113111221.

It is a m-pointer prime, because the next prime (1221113112383) can be obtained adding 1221113112311 to its product of digits (72).

It is a weak prime.

It is an emirp because it is prime and its reverse (1132113111221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221113112311 - 2¹⁴ = 1221113095927 is a prime.

It is a super-2 number, since 2×1221113112311² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221113111311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610556556155 + 610556556156.

It is an arithmetic number, because the mean of its divisors is an integer number (610556556156).

Almost surely, 2^{1221113112311} is an apocalyptic number.

1221113112311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221113112311 is an equidigital number, since it uses as much as digits as its factorization.

1221113112311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 20.

Adding to 1221113112311 its reverse (1132113111221), we get a palindrome (2353226223532).

The spelling of 1221113112311 in words is "one trillion, two hundred twenty-one billion, one hundred thirteen million, one hundred twelve thousand, three hundred eleven".