221043444020 has 24 divisors (see below), whose sum is σ = 530504265984. Its totient is φ = 75786323616.

The previous prime is 221043443981. The next prime is 221043444031. The reversal of 221043444020 is 20444340122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789440732 + ... + 789441011.

It is an arithmetic number, because the mean of its divisors is an integer number (22104344416).

Almost surely, 2^221043444020 is an apocalyptic number.

221043444020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221043444020 is an abundant number, since it is smaller than the sum of its proper divisors (309460821964).

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

221043444020 is a wasteful number, since it uses less digits than its factorization.

221043444020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578881759 (or 1578881757 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 221043444020 its reverse (20444340122), we get a palindrome (241487784142).

The spelling of 221043444020 in words is "two hundred twenty-one billion, forty-three million, four hundred forty-four thousand, twenty".