221130430444 has 48 divisors (see below), whose sum is σ = 482570113536. Its totient is φ = 86136192000.

The previous prime is 221130430387. The next prime is 221130430457. The reversal of 221130430444 is 444034031122.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1403937 + ... + 1553479.

It is an arithmetic number, because the mean of its divisors is an integer number (10053544032).

Almost surely, 2^221130430444 is an apocalyptic number.

It is an amenable number.

221130430444 is an abundant number, since it is smaller than the sum of its proper divisors (261439683092).

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

221130430444 is a wasteful number, since it uses less digits than its factorization.

221130430444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154366 (or 154364 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 221130430444 its reverse (444034031122), we get a palindrome (665164461566).

The spelling of 221130430444 in words is "two hundred twenty-one billion, one hundred thirty million, four hundred thirty thousand, four hundred forty-four".