1221103442 has 32 divisors (see below), whose sum is σ = 2066238720. Its totient is φ = 537007680.

The previous prime is 1221103441. The next prime is 1221103459. The reversal of 1221103442 is 2443011221.

It is not an unprimeable number, because it can be changed into a prime (1221103441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157067 + ... + 164657.

It is an arithmetic number, because the mean of its divisors is an integer number (64569960).

Almost surely, 2^1221103442 is an apocalyptic number.

1221103442 is a deficient number, since it is larger than the sum of its proper divisors (845135278).

1221103442 is a wasteful number, since it uses less digits than its factorization.

1221103442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7898.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221103442 is about 34944.2905493873. The cubic root of 1221103442 is about 1068.8517807745.

Adding to 1221103442 its reverse (2443011221), we get a palindrome (3664114663).

The spelling of 1221103442 in words is "one billion, two hundred twenty-one million, one hundred three thousand, four hundred forty-two".