221320204404 has 48 divisors (see below), whose sum is σ = 556231206720. Its totient is φ = 68087105280.

The previous prime is 221320204297. The next prime is 221320204433. The reversal of 221320204404 is 404402023122.

221320204404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 838987 + ... + 1070765.

It is an arithmetic number, because the mean of its divisors is an integer number (11588150140).

Almost surely, 2^221320204404 is an apocalyptic number.

It is an amenable number.

221320204404 is an abundant number, since it is smaller than the sum of its proper divisors (334911002316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221320204404 is a wasteful number, since it uses less digits than its factorization.

221320204404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237920 (or 237918 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 221320204404 its reverse (404402023122), we get a palindrome (625722227526).

The spelling of 221320204404 in words is "two hundred twenty-one billion, three hundred twenty million, two hundred four thousand, four hundred four".