1221210112103 has 4 divisors (see below), whose sum is σ = 1221216472440. Its totient is φ = 1221203751768.

The previous prime is 1221210112069. The next prime is 1221210112117. The reversal of 1221210112103 is 3012110121221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221210112103 - 2³⁰ = 1220136370279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221210112193) 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 3 ways as a sum of consecutive naturals, for example, 2882900 + ... + 3279257.

It is an arithmetic number, because the mean of its divisors is an integer number (305304118110).

Almost surely, 2^{1221210112103} is an apocalyptic number.

1221210112103 is a deficient number, since it is larger than the sum of its proper divisors (6360337).

1221210112103 is an equidigital number, since it uses as much as digits as its factorization.

1221210112103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6360336.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221210112103 its reverse (3012110121221), we get a palindrome (4233320233324).

The spelling of 1221210112103 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, one hundred three".