1221020221103 has 16 divisors (see below), whose sum is σ = 1236652246080. Its totient is φ = 1205432236800.

The previous prime is 1221020221081. The next prime is 1221020221111. The reversal of 1221020221103 is 3011220201221.

It is a cyclic number.

It is not a de Polignac number, because 1221020221103 - 2³⁶ = 1152300744367 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 (1221020221133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240497801 + ... + 240502877.

It is an arithmetic number, because the mean of its divisors is an integer number (77290765380).

Almost surely, 2^{1221020221103} is an apocalyptic number.

1221020221103 is a deficient number, since it is larger than the sum of its proper divisors (15632024977).

1221020221103 is a wasteful number, since it uses less digits than its factorization.

1221020221103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8818.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221020221103 its reverse (3011220201221), we get a palindrome (4232240422324).

The spelling of 1221020221103 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred three".