221079748 has 12 divisors (see below), whose sum is σ = 394189740. Its totient is φ = 108454112.

The previous prime is 221079737. The next prime is 221079757. The reversal of 221079748 is 847970122.

It can be written as a sum of positive squares in 2 ways, for example, as 153313924 + 67765824 = 12382^2 + 8232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221079748.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521203 + ... + 521626.

It is an arithmetic number, because the mean of its divisors is an integer number (32849145).

Almost surely, 2^221079748 is an apocalyptic number.

It is an amenable number.

221079748 is a deficient number, since it is larger than the sum of its proper divisors (173109992).

221079748 is a wasteful number, since it uses less digits than its factorization.

221079748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042886 (or 1042884 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 221079748 is about 14868.7507208911. The cubic root of 221079748 is about 604.6670736173.

The spelling of 221079748 in words is "two hundred twenty-one million, seventy-nine thousand, seven hundred forty-eight".