221495816 has 16 divisors (see below), whose sum is σ = 415703040. Its totient is φ = 110641680.

The previous prime is 221495809. The next prime is 221495849. The reversal of 221495816 is 618594122.

It is a self number, because there is not a number n which added to its sum of digits gives 221495816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4040 + ... + 21431.

It is an arithmetic number, because the mean of its divisors is an integer number (25981440).

Almost surely, 2^221495816 is an apocalyptic number.

It is an amenable number.

221495816 is a deficient number, since it is larger than the sum of its proper divisors (194207224).

221495816 is a wasteful number, since it uses less digits than its factorization.

221495816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26564 (or 26560 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 221495816 is about 14882.7355012444. The cubic root of 221495816 is about 605.0461599914.

The spelling of 221495816 in words is "two hundred twenty-one million, four hundred ninety-five thousand, eight hundred sixteen".