221878672 has 10 divisors (see below), whose sum is σ = 429889958. Its totient is φ = 110939328.

The previous prime is 221878649. The next prime is 221878711. The reversal of 221878672 is 276878122.

It can be written as a sum of positive squares in only one way, i.e., 156850576 + 65028096 = 12524^2 + 8064^2 .

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 as a sum of consecutive naturals, namely, 6933693 + ... + 6933724.

Almost surely, 2^221878672 is an apocalyptic number.

It is an amenable number.

221878672 is a deficient number, since it is larger than the sum of its proper divisors (208011286).

221878672 is a wasteful number, since it uses less digits than its factorization.

221878672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13867425 (or 13867419 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 221878672 is about 14895.5923682142. The cubic root of 221878672 is about 605.3945671957.

The spelling of 221878672 in words is "two hundred twenty-one million, eight hundred seventy-eight thousand, six hundred seventy-two".