221248928549 has 8 divisors (see below), whose sum is σ = 241566852960. Its totient is φ = 200965068400.

The previous prime is 221248928519. The next prime is 221248928557. The reversal of 221248928549 is 945829842122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221248928549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221248928494 and 221248928503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221248928519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8502479 + ... + 8528460.

It is an arithmetic number, because the mean of its divisors is an integer number (30195856620).

Almost surely, 2^221248928549 is an apocalyptic number.

It is an amenable number.

221248928549 is a deficient number, since it is larger than the sum of its proper divisors (20317924411).

221248928549 is a wasteful number, since it uses less digits than its factorization.

221248928549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17032131.

The product of its digits is 6635520, while the sum is 56.

The spelling of 221248928549 in words is "two hundred twenty-one billion, two hundred forty-eight million, nine hundred twenty-eight thousand, five hundred forty-nine".