221541223120 has 80 divisors (see below), whose sum is σ = 596118274560. Its totient is φ = 74995494912.

The previous prime is 221541223063. The next prime is 221541223133. The reversal of 221541223120 is 21322145122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2459617 + ... + 2548096.

It is an arithmetic number, because the mean of its divisors is an integer number (7451478432).

Almost surely, 2^221541223120 is an apocalyptic number.

221541223120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221541223120 is an abundant number, since it is smaller than the sum of its proper divisors (374577051440).

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

221541223120 is a wasteful number, since it uses less digits than its factorization.

221541223120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007812 (or 5007806 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 221541223120 its reverse (21322145122), we get a palindrome (242863368242).

The spelling of 221541223120 in words is "two hundred twenty-one billion, five hundred forty-one million, two hundred twenty-three thousand, one hundred twenty".