1221220013103 has 24 divisors (see below), whose sum is σ = 1911184271568. Its totient is φ = 748435790592.

The previous prime is 1221220013099. The next prime is 1221220013147. The reversal of 1221220013103 is 3013100221221.

It is not a de Polignac number, because 1221220013103 - 2² = 1221220013099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220014103) 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 23 ways as a sum of consecutive naturals, for example, 92805400 + ... + 92818557.

It is an arithmetic number, because the mean of its divisors is an integer number (79632677982).

Almost surely, 2^{1221220013103} is an apocalyptic number.

1221220013103 is a deficient number, since it is larger than the sum of its proper divisors (689964258465).

1221220013103 is a wasteful number, since it uses less digits than its factorization.

1221220013103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185624023 (or 185624020 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221220013103 its reverse (3013100221221), we get a palindrome (4234320234324).

The spelling of 1221220013103 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, thirteen thousand, one hundred three".