221994928 has 10 divisors (see below), whose sum is σ = 430115204. Its totient is φ = 110997456.

The previous prime is 221994923. The next prime is 221994953. The reversal of 221994928 is 829499122.

It is not an unprimeable number, because it can be changed into a prime (221994923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6937326 + ... + 6937357.

Almost surely, 2^221994928 is an apocalyptic number.

It is an amenable number.

221994928 is a deficient number, since it is larger than the sum of its proper divisors (208120276).

221994928 is a wasteful number, since it uses less digits than its factorization.

221994928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13874691 (or 13874685 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 221994928 is about 14899.4942196036. The cubic root of 221994928 is about 605.5002833235.

The spelling of 221994928 in words is "two hundred twenty-one million, nine hundred ninety-four thousand, nine hundred twenty-eight".