1221102111103 has 12 divisors (see below), whose sum is σ = 1420700196792. Its totient is φ = 1046486180880.

The previous prime is 1221102111077. The next prime is 1221102111113. The reversal of 1221102111103 is 3011112011221.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1221102111103 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 (1221102111113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1756488 + ... + 2351053.

It is an arithmetic number, because the mean of its divisors is an integer number (118391683066).

Almost surely, 2^{1221102111103} is an apocalyptic number.

1221102111103 is a deficient number, since it is larger than the sum of its proper divisors (199598085689).

1221102111103 is an equidigital number, since it uses as much as digits as its factorization.

1221102111103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113622 (or 4113615 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1221102111103 its reverse (3011112011221), we get a palindrome (4232214122324).

The spelling of 1221102111103 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred eleven thousand, one hundred three".