1211221112107 has 2 divisors, whose sum is σ = 1211221112108. Its totient is φ = 1211221112106.

The previous prime is 1211221112089. The next prime is 1211221112173. The reversal of 1211221112107 is 7012111221121.

It is a weak prime.

It is an emirp because it is prime and its reverse (7012111221121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211221112107 - 2²⁷ = 1211086894379 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211221112807) 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, 605610556053 + 605610556054.

It is an arithmetic number, because the mean of its divisors is an integer number (605610556054).

Almost surely, 2^{1211221112107} is an apocalyptic number.

1211221112107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211221112107 is an equidigital number, since it uses as much as digits as its factorization.

1211221112107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 1211221112107 its reverse (7012111221121), we get a palindrome (8223332333228).

The spelling of 1211221112107 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred seven".