221685354828448 has 48 divisors (see below), whose sum is σ = 498800996132544. Its totient is φ = 95006304875520.

The previous prime is 221685354828367. The next prime is 221685354828467. The reversal of 221685354828448 is 844828453586122.

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, 3677511 + ... + 21375097.

It is an arithmetic number, because the mean of its divisors is an integer number (10391687419428).

Almost surely, 2^{221685354828448} is an apocalyptic number.

221685354828448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221685354828448 is an abundant number, since it is smaller than the sum of its proper divisors (277115641304096).

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

221685354828448 is a wasteful number, since it uses less digits than its factorization.

221685354828448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17753525 (or 17753517 counting only the distinct ones).

The product of its digits is 943718400, while the sum is 70.

The spelling of 221685354828448 in words is "two hundred twenty-one trillion, six hundred eighty-five billion, three hundred fifty-four million, eight hundred twenty-eight thousand, four hundred forty-eight".