1211221112103 has 18 divisors (see below), whose sum is σ = 1816739373384. Its totient is φ = 807480737028.

The previous prime is 1211221112089. The next prime is 1211221112107. The reversal of 1211221112103 is 3012111221121.

It is a happy number.

It is not a de Polignac number, because 1211221112103 - 2⁵ = 1211221112071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221112107) 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 in 17 ways as a sum of consecutive naturals, for example, 92298051 + ... + 92311172.

It is an arithmetic number, because the mean of its divisors is an integer number (100929965188).

Almost surely, 2^{1211221112103} is an apocalyptic number.

1211221112103 is a deficient number, since it is larger than the sum of its proper divisors (605518261281).

1211221112103 is an frugal number, since it uses more digits than its factorization.

1211221112103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184609247 (or 184609226 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1211221112103 its reverse (3012111221121), we get a palindrome (4223332333224).

The spelling of 1211221112103 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred three".