221678882 has 8 divisors (see below), whose sum is σ = 340628652. Its totient is φ = 108136000.

The previous prime is 221678879. The next prime is 221678927. The reversal of 221678882 is 288876122.

It can be written as a sum of positive squares in 2 ways, for example, as 171112561 + 50566321 = 13081^2 + 7111^2 .

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

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, 1351619 + ... + 1351782.

Almost surely, 2^221678882 is an apocalyptic number.

221678882 is a deficient number, since it is larger than the sum of its proper divisors (118949770).

221678882 is a wasteful number, since it uses less digits than its factorization.

221678882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703444.

The product of its digits is 172032, while the sum is 44.

The square root of 221678882 is about 14888.8845116080. The cubic root of 221678882 is about 605.2128040408.

The spelling of 221678882 in words is "two hundred twenty-one million, six hundred seventy-eight thousand, eight hundred eighty-two".